解方程 ( 要过程和检验 )
x-4/9=5/18
x=5/18+4/9
x=13/18
3/8+x=3/4
x=3/4-3/8
x=3/8
5/6-x=1/4
x=5/6-1/4
x=7/12
x+9/10=2
x=2-9/10
x=1.1
x=4/6=5/18??????
3/8+x=3/4 5/6-x=1/4
解: x=3/4-3/8 检验:3/8+3/8=3/4 解: x=5/6-1/4 检验:5/6-7/12=1/4
x=3/8 x=7/12
x+9/10=2
解: x=2-9/10 检验:11/10+9/10=2
x=11/10
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