( x+3)/0.2-(0.4x-1)/0.
3个回答
10(x+3)/2-10(0.4x-1)/5=-25
50(x+3)-20(0.4x-1)=-250
50x+150-8x+20=-250
42x+170=-250
42x=-420
x=-10
相关问题
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3x²-2x+1<0 3x²-4<0