问题 解答题
脱式计算下面各题,怎样简便就怎样算.
5.2×39.83.8×1.4+6270.4÷(41-28.5)÷0.8.
答案

(1)5.2×39.8,

=5.2×(40-0.2),

=5.2×40-5.2×0.2,

=208-1.04,

=206.96;

(2)3.8×1.4+6,

=5.32+6,

=11.32;

(3)270.4÷(41-28.5)÷0.8,

=270.4÷12.5÷0.8,

=270.4÷(12.5×0.8),

=270.4÷10,

=27.04.

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