下面题目如何简便计算?5.3×99+5.3-302.23×五分之二+2.77÷2.5

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下面题目如何简便计算?5.3×99+5.3-302.23×五分之二+2.77÷2.5
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下面题目如何简便计算?5.3×99+5.3-302.23×五分之二+2.77÷2.5
下面题目如何简便计算?
5.3×99+5.3-30
2.23×五分之二+2.77÷2.5

下面题目如何简便计算?5.3×99+5.3-302.23×五分之二+2.77÷2.5
5.3×99+5.3-30
=5.3×(99+1)-30
=5.3×100-30
=530-30
=500
2.23×五分之二+2.77÷2.5
=2.23×0.4+2.77×0.4
=0.4×(2.23+2.77)
=0.4×5
=2