七年级化简求值

七年级化简求值练习题

(5-4x)(5+4x)-2x(1-3x),其中x=-2 2X―[6-2(X-2)] 其中 X=-2

(5a+2a2-3-4a3)-(-a+3a3-a2),其中a=-2

(2m2n+2mn2)-[2(m2n-1)+2mn2+2],其中m=-2,n=2

(5a+2a2-3-4a3)-(-a+3a3-a2),其中a=-2

(2m2n+2mn2)-[2(m2n-1)+2mn2+2],其中m=-2,n=2

3(ab+bc)-3(ab-ac)-4ac-3bc 其中:a=2001/2002,b=1/3,c=1

(3xy+10y)+[5x-(2xy+2y-3x)]其中xy=2,x+y=3

已知a=-2,b=-1,c=3,求代数式5abc-2a2b+[3abc-(4ab2-a2b)]的值。 2 ( a2b + ab2)- [ 2ab2 - (1- a2b) ] - 2,其中a= -2,b=0.5

(-3x2-4y)-(2x2-5y+6)+(x2-5y-1) 其中 x=-3 ,y=-1

解方程:7(2x-1)-3(4x-1)=4(3x+2)-1; (5y+1)+ (1-y)= (9y+1)+ (1-3y);

20%+(1-20%)(320-x)=320×40% 2(x-2)+2=x+1 2(x-2)-3(4x-1)=9(1-x)

11x+64-2x=100-9x 15-(8-5x)=7x+(4-3x) 3(x-7)-2[9-4(2-x)]=22

3/2[2/3(1/4x-1)-2]-x=2 2x-10.3x=15 0.52x-(1-0.52)x=80

x/2+3x/2=7 3x+7=32-2x 3x+5(138-x)=540

3x-7(x-1)=3-2(x+3) 18x+3x-3=18-2(2x-1) 3(20-y)=6y-4(y-11)

-(x/4-1)=5 3[4(5y-1)-8]=6 10/3 (x/5+3/7)=9x/2

5/3(x+0.5)+2=3x-6 5x+2(2x/3+2)=2/3(x-6)+2 (2x-7)/2-(6x-5)/3=2x+3

(3x+2)/5-(x-6)=x/3 6x-(x/3+2)=2(x/5+5/2)-3 3(x/11-2)-5=2+3x/3

10/3(2x-6)=3/5 x/2-(x/3-2)=3 2/3(x+3)-3=5x/3

5/3(2x-5/3)=2x/5-8/9 25(x/3-x/2+2/5)-2=3/5(x-2/7)+4/9 32X+88=3480

X-(135-98)=25 4X-15=17 8×125-40X=600

0.4X÷5=0.6 2X+0.82=0.82 3+0.5X=7

X+80×2=200 45-2X=10+15 8×2.5- 4x=18

6÷(1.5+ x)=1.5 4+x+3.9=15.1 x-0.13-7.5=3.24

7.5×4.2 - 6x = 1.5 0.5X+4=6 9.5x -5x =13

3X+2.4=2.4 80X÷4=120. 12χ+1.8×0.9=7.2 (9-5χ)×0.3=1.02 6.4χ-χ=28+4.4

计算题;

3/7 × 49/9 - 4/3 8/9 × 15/36 + 1/27 12× 5/6 – 2/9 ×3

8× 5/4 + 1/4 5. 6÷ 3/8 – 3/8 ÷6 4/7 × 5/9 + 3/7 × 5/9 .

7/8 + ( 1/8 + 1/9 ) 9 × 5/6 + 5/6 7 × 5/49 + 3/14

6 ×( 1/2 + 2/3 ) 8 × 4/5 + 8 × 11/5 31 × 5/6 – 5/6

5/9 × 18 – 14 × 2/7 4/5 × 25/16 + 2/3 × 3/4 14 × 8/7 – 5/6 × 12/15

17/32 – 3/4 × 9/24 3 × 2/9 + 1/3 5/7 × 3/25 + 3/7 . 3/14

1/5 × 2/3 + 5/6 9/22 + 1/11 ÷ 1/2 5/3 × 11/5 + 4/3

45 × 2/3 + 1/3 × 15 7/19 + 12/19 × 5/6 1/4 + 3/4 ÷ 2/3

8/7 × 21/16 + 1/2 101 × 1/5 – 1/5 × 21 50+160÷40 (58+370)÷(64-45)

120-144÷18+35 347+45×2-4160÷52 (58+37)÷(64-9×5)

95÷(64-45) 178-145÷5×6+42 420+580-64×21÷28

812-700÷(9+31×11) (136+64)×(65-345÷23) 85+14×(14+208÷26)

(284+16)×(512-8208÷18) 120-36×4÷18+35 (58+37)÷(64-9×5) .

(6.8-6.8×0.55)÷8.5 0.12× 4.8÷0.12×4.8 (3.2×1.5+2.5)÷1.6


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