0.2(45-x)=13-x
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0.2(45-x)=13-x0.2(45-x)=13-x0.2(45-x)=13-x0.2(45-x)=13-x0.2*45-0.2x=13-x9-0.2x=13-xx-0.2x=13-90.8x=4
0.2(45-x)=13-x
0.2(45-x)=13-x
0.2(45-x)=13-x
0.2(45-x)=13-x
0.2*45-0.2x=13-x
9-0.2x=13-x
x-0.2x=13-9
0.8x=4
x=5
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0.2(45-x)=13-x 两边乘以 5 得
45-x=(13-x)*5
45-x=65-5x 两边加5x
4x+45=65 两边减 45
4x=20 两边除以4
x=5
0.2*45-0.2x=13-x
1/5*45-1/5x=13-x
9-1/5x=13-x
x-1/5x=13-9
4/5x=4
x=5
0.2(45-x)=13-x
0.2x=0.8x-7.8(x=-13,x=13,x=12)
(45-X)/(13-X)=0.2如何解
13x-7x+9=45
求1/2x^2-1/4x+0.2x^3+0.25x-0.5x^2-1/5x^3+0.5x-1 其中x=12/13
求1/2x^2-1/4x+0.2x^3+0.25x-0.5x^2-1/5x^3+0.5x-1 其中x=12/13
(X+X)+(X-X)+(X*X)+(X/X)=100
x-30-0.2x=0.5x
x-0.2x=80 求x
x-20%x=45+20%x
4x+9x=13x
X+13%X-28%X=3.
x+13%x-28%x=3.4
13x-6.8x+x=46.
13x-15x+x=-3
x*x-10*x=13急
(X-8)/X=0.2(X-8)/X=0.2
(x-1)+(x+2)+0.2x+2x=46