40+x-(50-x)=4怎么做?
问题描述:
40+x-(50-x)=4怎么做?
答
40+x-(50-x)
=40+x-50+x
=2x-10=4
x=7
40+x-(50-x)=4怎么做?
40+x-(50-x)
=40+x-50+x
=2x-10=4
x=7