(X/2+40)/(x/10)=(X/2-40)/(x/15)
问题描述:
(X/2+40)/(x/10)=(X/2-40)/(x/15)
答
(X/2+40)/(x/10)=(X/2-40)/(x/15)
2(X/2+40)=3(X/2-40)
x+80=1.5x-120
0.5x=200
x=400能解释一下,(X/2+40)/(x/10)=(X/2-40)/(x/15)为什么会变成2(X/2+40)=3(X/2-40)呢?(X/2+40)/(x/10)=(X/2-40)/(x/15)(X/2+40)*10/x=(X/2-40)*15/x(X/2+40)*10=(X/2-40)*152(X/2+40)=3(X/2-40)x+80=1.5x-1200.5x=200x=400