列竖式计算．2.3+7.9= 23×31= 721÷7=806÷2= 78×55= 815÷9=验算．
10-÷×1
325×0.36+6.75×36
5.6×0.375+×5.4-0.375×0.9
5.6x+4x=17.28
x+=
-
÷
×1
×5.4-0.375×0.9
x+
=
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