5/8=X-2/10,求未知数X
问题描述：
5/8=X-2/10,求未知数X
答
X=33/40
答
5/8=(X-2)/10
8(x-2)=5*10
8x-16=50
8x=50+16=66
x=66/8=33/4
答
5/8=X-2/10
X=-5/8-2/10
X=-25/40-8/40
X=-17/40
答
5/8=x-2/10
x=5/8+2/10
x=33/40
答
x=5/8+2/10 =25/40+8/40=33/40