x-30%x=(280-x)+30%x
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x-30%x=(280-x)+30%x
x-30%x=(280-x)+30%x
x-30%x=(280-x)+30%x
x-30%x=(280-x)+30%x
70%x=280-x+30%x
70%x=280-70%x
70%x+70%x=280
140%x=280
x=200
x-30%x=(280-x)+30%x
x-0.3x-280+x-0.3x=0
x=200
x-30%x=280-x+30%x
合并同类项:
(1-30%-30%+1)x=280
即
140%x=280
所以
x=200
(x+30)*(x-18)=x*x
x-30%x=(280-x)+30%x
30/x=30/(x-1.5)-x
0.8x=x-30 x=
x ( x-30)= -67.5 X=?
x-30-0.2x=0.5x
3X+30+X+X-15=?
x+35=(x+3x)*30%
60x(x-4)=30x
80%x+30-x=10%x
X-30%X+8-X=20
30%x=50%x-20x
(X+X)+(X-X)+(X*X)+(X/X)=100
x-(30-x)=(30-x)-x/3,怎么解
X×X-(X-10)(X-10)=30×30
50%x+x=20 x+30%x=52
x-30%x=14x+25%x=20
x^2=(x+30)X(x-18)怎么解