初中数学计算题100道 数学计算题。

1)x^2-9x+8=0 答案：x1=8 x2=1 (2)x^2+6x-27=0 答案：x1=3 x2=-9 (3)x^2-2x-80=0 答案：x1=-8 x2=10 (4)x^2+10x-200=0 答案：x1=-20 x2=10 (5)x^2-20x+96=0 答案：x1=12 x2=8 (6)x^2+23x+76=0 答案：x1=-19 x2=-4 (7)x^2-25x+154=0 答案：x1=14 x2=11 (8)x^2-12x-108=0 答案：x1=-6 x2=18 (9)x^2+4x-252=0 答案：x1=14 x2=-18 (10)x^2-11x-102=0 答案：x1=17 x2=-6 (11)x^2+15x-54=0 答案：x1=-18 x2=3 (12)x^2+11x+18=0 答案：x1=-2 x2=-9 (13)x^2-9x+20=0 答案：x1=4 x2=5 (14)x^2+19x+90=0 答案：x1=-10 x2=-9 (15)x^2-25x+156=0 答案：x1=13 x2=12 (16)x^2-22x+57=0 答案：x1=3 x2=19 (17)x^2-5x-176=0 答案：x1=16 x2=-11 (18)x^2-26x+133=0 答案：x1=7 x2=19 (19)x^2+10x-11=0 答案：x1=-11 x2=1 (20)x^2-3x-304=0 答案：x1=-16 x2=19 (21)x^2+13x-140=0 答案：x1=7 x2=-20 (22)x^2+13x-48=0 答案：x1=3 x2=-16 (23)x^2+5x-176=0 答案：x1=-16 x2=11 (24)x^2+28x+171=0 答案：x1=-9 x2=-19 (25)x^2+14x+45=0 答案：x1=-9 x2=-5 (26)x^2-9x-136=0 答案：x1=-8 x2=17 (27)x^2-15x-76=0 答案：x1=19 x2=-4 (28)x^2+23x+126=0 答案：x1=-9 x2=-14 (29)x^2+9x-70=0 答案：x1=-14 x2=5 (30)x^2-1x-56=0 答案：x1=8 x2=-7 (31)x^2+7x-60=0 答案：x1=5 x2=-12 (32)x^2+10x-39=0 答案：x1=-13 x2=3 (33)x^2+19x+34=0 答案：x1=-17 x2=-2 (34)x^2-6x-160=0 答案：x1=16 x2=-10 (35)x^2-6x-55=0 答案：x1=11 x2=-5 (36)x^2-7x-144=0 答案：x1=-9 x2=16 (37)x^2+20x+51=0 答案：x1=-3 x2=-17 (38)x^2-9x+14=0 答案：x1=2 x2=7 (39)x^2-29x+208=0 答案：x1=16 x2=13 (40)x^2+19x-20=0 答案：x1=-20 x2=1 (41)x^2-13x-48=0 答案：x1=16 x2=-3 (42)x^2+10x+24=0 答案：x1=-6 x2=-4 (43)x^2+28x+180=0 答案：x1=-10 x2=-18 (44)x^2-8x-209=0 答案：x1=-11 x2=19 (45)x^2+23x+90=0 答案：x1=-18 x2=-5 (46)x^2+7x+6=0 答案：x1=-6 x2=-1 (47)x^2+16x+28=0 答案：x1=-14 x2=-2 (48)x^2+5x-50=0 答案：x1=-10 x2=5 (49)x^2+13x-14=0 答案：x1=1 x2=-14 (50)x^2-23x+102=0 答案：x1=17 x2=6 (51)x^2+5x-176=0 答案：x1=-16 x2=11 (52)x^2-8x-20=0 答案：x1=-2 x2=10 (53)x^2-16x+39=0 答案：x1=3 x2=13 (54)x^2+32x+240=0 答案：x1=-20 x2=-12 (55)x^2+34x+288=0 答案：x1=-18 x2=-16 (56)x^2+22x+105=0 答案：x1=-7 x2=-15 (57)x^2+19x-20=0 答案：x1=-20 x2=1 (58)x^2-7x+6=0 答案：x1=6 x2=1 (59)x^2+4x-221=0 答案：x1=13 x2=-17 (60)x^2+6x-91=0 答案：x1=-13 x2=7 (61)x^2+8x+12=0 答案：x1=-2 x2=-6 (62)x^2+7x-120=0 答案：x1=-15 x2=8 (63)x^2-18x+17=0 答案：x1=17 x2=1 (64)x^2+7x-170=0 答案：x1=-17 x2=10 (65)x^2+6x+8=0 答案：x1=-4 x2=-2 (66)x^2+13x+12=0 答案：x1=-1 x2=-12 (67)x^2+24x+119=0 答案：x1=-7 x2=-17 (68)x^2+11x-42=0 答案：x1=3 x2=-14 (69)x^20x-289=0 答案：x1=17 x2=-17 (70)x^2+13x+30=0 答案：x1=-3 x2=-10 (71)x^2-24x+140=0 答案：x1=14 x2=10 (72)x^2+4x-60=0 答案：x1=-10 x2=6 (73)x^2+27x+170=0 答案：x1=-10 x2=-17 (74)x^2+27x+152=0 答案：x1=-19 x2=-8 (75)x^2-2x-99=0 答案：x1=11 x2=-9 (76)x^2+12x+11=0 答案：x1=-11 x2=-1 (77)x^2+17x+70=0 答案：x1=-10 x2=-7 (78)x^2+20x+19=0 答案：x1=-19 x2=-1 (79)x^2-2x-168=0 答案：x1=-12 x2=14 (80)x^2-13x+30=0 答案：x1=3 x2=10 (81)x^2-10x-119=0 答案：x1=17 x2=-7 (82)x^2+16x-17=0 答案：x1=1 x2=-17 (83)x^2-1x-20=0 答案：x1=5 x2=-4 (84)x^2-2x-288=0 答案：x1=18 x2=-16 (85)x^2-20x+64=0 答案：x1=16 x2=4 (86)x^2+22x+105=0 答案：x1=-7 x2=-15 (87)x^2+13x+12=0 答案：x1=-1 x2=-12 (88)x^2-4x-285=0 答案：x1=19 x2=-15 (89)x^2+26x+133=0 答案：x1=-19 x2=-7 (90)x^2-17x+16=0 答案：x1=1 x2=16 (91)x^2+3x-4=0 答案：x1=1 x2=-4 (92)x^2-14x+48=0 答案：x1=6 x2=8 (93)x^2-12x-133=0 答案：x1=19 x2=-7 (94)x^2+5x+4=0 答案：x1=-1 x2=-4 (95)x^2+6x-91=0 答案：x1=7 x2=-13 (96)x^2+3x-4=0 答案：x1=-4 x2=1 (97)x^2-13x+12=0 答案：x1=12 x2=1 (98)x^2+7x-44=0 答案：x1=-11 x2=4 (99)x^2-6x-7=0 答案：x1=-1 x2=7 (100)x^2-9x-90=0 答案：x1=15 x2=-6

100道初中数学计算题及答案~

①5√8-2√32+√50
=5*3√2-2*4√2+5√2
=√2(15-8+5)
=12√2
②√6-√3/2-√2/3
=√6-√6/2-√6/3
=√6/6
③(√45+√27)-(√4/3+√125)
=(3√5+3√3)-(2√3/3+5√5)
=-2√5+7√5/3
④(√4a-√50b)-2(√b/2+√9a)
=(2√a-5√2b)-2(√2b/2+3√a)
=-4√a-6√2b
⑤√4x*(√3x/2-√x/6)
=2√x(√6x/2-√6x/6)
=2√x*(√6x/3)
=2/3*|x|*√6
⑥(x√y-y√x)÷√xy
=x√y÷√xy-y√x÷√xy
=√x-√y
⑦(3√7+2√3)(2√3-3√7)
=(2√3)^2-(3√7)^2
=12-63
=-51
⑧(√32-3√3)(4√2+√27)
=(4√2-3√3)(4√2+3√3)
=(4√2)^2-(3√3)^2
=32-27
=5
⑨(3√6-√4)?
=(3√6)^2-2*3√6*√4+(√4)^2
=54-12√6+4
=58-12√6
⑩（1+√2-√3）（1-√2+√3）
=[1+(√2-√3)][1-(√2-√3)]
=1-(√2-√3)^2
=1-(2+3+2√6)
=-4-2√6

（1）5√12×√18
=5*2√3*3√2
=30√6;

（2）-6√45×（-4√48）
=6*3√5*4*4√3
=288√15;

（3）√(12a)×√(3a) /4
=√(36a^2)/4
=6a/4
=3a/2.
5.
x^2(y+z)^2-2xy(x-z)(y+z)+y^2(x-z)^2
=[x(y+z)-y(x-z)]^2
=(xz+yz)^2
=z^2(x+y)^2

6.
3(a+2)^2+28(a+2)-20
=[3(a+2)-2][(a+2)+10]
=(3a+4)(a+12)

7.
(a+b)^2-(b-c)^2+a^2-c^2
=(a+b)^2-c^2+a^2-(b-c)^2
=(a+b+c)(a+b-c)+(a+b-c)(a-b+c)
=(a+b-c)(a+b+c+a-b+c)
=2(a+b-c)(a+c)

8.
x(x+1)(x^2+x-1)-2
=(x^2+x)(x^2+x-1)-2
=(x^2+x)^2-(x^2+x)-2
=(x^2+x-2)(x^2+x+1)
=(x+2)(x-1)(x^2+x+1)

9.
9x^2(x-1)^2-3(x^2-x)-56
=9x^2(x-1)^2-3x(x-1)-56
=[3x(x-1)-8][3x(x-1)+7]
=(3x^2-3x-8)(3x^2-3x+7)
有理数练习
练习一(B级)
(一)计算题:
(1)23+(-73) (2)(-84)+(-49) (3)7+(-2.04) (4)4.23+(-7.57) (5)(-7/3)+(-7/6) (6)9/4+(-3/2) (7)3.75+(2.25)+5/4 (8)-3.75+(+5/4)+(-1.5)
5.
x^2(y+z)^2-2xy(x-z)(y+z)+y^2(x-z)^2
=[x(y+z)-y(x-z)]^2
=(xz+yz)^2

=z^2(x+y)^2

6.
3(a+2)^2+28(a+2)-20
=[3(a+2)-2][(a+2)+10]
=(3a+4)(a+12)

7.
(a+b)^2-(b-c)^2+a^2-c^2
=(a+b)^2-c^2+a^2-(b-c)^2
=(a+b+c)(a+b-c)+(a+b-c)(a-b+c)
=(a+b-c)(a+b+c+a-b+c)
=2(a+b-c)(a+c)

8.
x(x+1)(x^2+x-1)-2
=(x^2+x)(x^2+x-1)-2
=(x^2+x)^2-(x^2+x)-2
=(x^2+x-2)(x^2+x+1)
=(x+2)(x-1)(x^2+x+1)

9.
9x^2(x-1)^2-3(x^2-x)-56
=9x^2(x-1)^2-3x(x-1)-56
=[3x(x-1)-8][3x(x-1)+7]
=(3x^2-3x-8)(3x^2-3x+7)
望采纳~~

因为5分之2是上坡路，4分之1是平路，20分之7是下坡路
所以（6*2）/(2/5+7/20）=16上坡+下坡总共是6KM，但来回一起走了两次，应乘以二

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