4.2-0.6x=3.6x 5x+2x=33.6 7x-4x=0.75 2x+7x+2.1=12 56x-32x-119=361 x+5=2x 3x+9=6x 4x-28=2x 2x+18=7x 5x=254-15x 7x-x+23=29.4 (28.8+5.5x+3.2）除2=71

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4.2-0.6x=3.6x 5x+2x=33.6 7x-4x=0.75 2x+7x+2.1=12 56x-32x-119=361 x+5=2x 3x+9=6x 4x-28=2x 2x+18=7x 5x=25*4-15x 7x-x+2*3=29.4 (28.8+5.5x+3.2）除2=71
4.2-0.6x=3.6x 5x+2x=33.6 7x-4x=0.75 2x+7x+2.1=12 56x-32x-119=361 x+5=2x 3x+9=6x 4x-28=2x 2x+18=7x 5x=25*4-15x 7x-x+2*3=29.4 (28.8+5.5x+3.2）除2=71

4.2-0.6x=3.6x 5x+2x=33.6 7x-4x=0.75 2x+7x+2.1=12 56x-32x-119=361 x+5=2x 3x+9=6x 4x-28=2x 2x+18=7x 5x=25*4-15x 7x-x+2*3=29.4 (28.8+5.5x+3.2）除2=71
4.2-0.6x=3.6x
4.2=4.2x
x=1
5x+2x=33.6
7x=33.6
x=4.8
7x-4x=0.75
3x=0.75
x=0.25
2x+7x+2.1=12
9x=14.1
x=14.1\9
56x-32x-119=361
24x=480
x=20
x+5=2x
5=x
4x-28=2x
2x=28
x=14
2x+18=7x
18=5x
x=8\5
5x=25*4-15x
20x=100
x=5
7x-x+2*3=29.4
6x+6=29.4
6x=23.4
x=23.4\6
(28.8+5.5x+3.2）除2=71
14.4+2.25x+1.6=71
2.25x=55
x=55\2.25

(1)x=1 (2)x=4.8 (3)x=0.25 (4)x=1.1 (5) x=20 (6)x=5 (7)x=3 (8)x=14 (9)x=3.6 (10)x=5 (11)x=-4/6 (12)x=20

4.2-0.6x=3.6x 5x+2x=33.6 7x-4x=0.75 2x+7x+2.1=12 56x-32x-119=361 x+5=2x 3x+9=6x 4x-28=2x 2x+18=7x 5x=25*4-15x 7x-x+2*3=29.4 (28.8+5.5x+3.2）除2=71 x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少? 解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6) (x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2 x(x-2)-2x(x+1)-3x(x-5) 其中x=负½ (x-3/x-2)-(x-2/x-1)=(x-5/x4) -(x-4/x-3) （X+X)+(X-X)+(X*X)+(X/X)=100 x-2x+3x-4x+5x.+99x-100x=25求解 2x+3x+4x+5x+x+6x+7x=100 x(x+1)+(x+2)+(x+3)+(x+4)+(x+5) = 27求x f(x,-x)=x^2+2x,fx(x,-x)=5x+1,则fy(x,-x)= x+2/x+1-x+4/x+3=x+6/x+5-x+8/x+7 x=? f(x)=x^2+x (x 用递归法求y=x-(x*x*x/3!)+(x*x*x*x*x/5!)-(x*x*x*x*x*x*x/7!)+. x^5-2x^3+x=? 写过程x(x-1)+2x(x+1)-3x(2x-5)-x(3x-2)+2x(2-x)=-5x(x-2)-4 5x+7=42 x÷4.2=2 3.6x-x=3.25 2（x-5x+7=42 x÷4.2=2 3.6x-x=3.25 2（x-3）=5.8.解方程 x*x*x*x*x=80000?