x加0.7减2.1等于5怎么算
问题描述:
x加0.7减2.1等于5怎么算
答
x+0.7-2.1=5
x+0.7=5+2.1
x+0.7=7.1
x=7.1-0.7
x=6.4
答
x+0.7-2.1=5
x-1.4=5
x=6.4