问题
解答题
怎样简便就怎样算
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答案
(1)16.4+3.5+83.6+166.5,
=(16.4+83.6)+(3.5+166.5),
=100+170,
=270;
(2)
×38.3+2.7×0.8,4 5
=0.8×38.3+2.7×0.8,
=0.8×(38.3+2.7),
=0.8×41,
=32.8;
(3)498+9870÷35,
=498+282,
=780;
(4)420.5-294÷2.8×2.1,
=420.5-105×2.1,
=420.5-220.5,
=200.