问题 解答题
怎样简便就怎样计算
①56×99
②0.7+3.9+4.3+6.1③95.6×18+4.4×18.
答案

(1)56×99,

=56×(100-1),

=56×100-56×1,

=5600-56,

=5544;

(2)0.7+3.9+4.3+6.1,

=(0.7+4.3)+(3.9+4.1),

=5+8,

=13;

(3)95.6×18+4.4×18,

=(95.6+4.4)×18,

=100×18,

=1800.

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