10x×0.7=10+0.6×10(x-1)

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10x×0.7=10+0.6×10(x-1)
7x=10+6x-6
7x-6x=10-6
x=4

7x=10+6(x-1)
7x=10+6x-6
7x-6x=4
x=4

10x×0.7=10+0.6×10(x-1)
7X=10+6(X-1)
7X=10+6X-6
7X=4+6X
7X-6X=4
X=4

(x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2 (x+7/x+6) +(x+9/x+8)=9x=(x+10/x+9) +(x+6/x+5) 解方程(x/x(x+2))+(x/(x+2)(x+4))+.+x/(x+8)(x+10)=1 X+X+X+(X-1)+(X-2)+(X-3)+(X-4)=10(X-3)+(X-4) 25％x+x=10 x=? X+X-10+X+8=100 80%x+30-x=10%x 10x+x*x=40 求x:x(10^x)=100 x^2+10x( )=(x+ )^2 x^2-10x=2-x 2x×x=10,求x x²-10x+()=(x-)² 3x-x(10-x)=15 x(x-20)=x+10 x*x-10*x=13急 10%x+x=13.x是多少 0.7X+10=0.4x