题目内容

【题目】用简便方法计算下列各题。

3.45×3.6+0.345×64 0.78×101 3.26×5.7-3.26×0.7

56.5×99+56.5 1.25×213×0.8 19.625-(4.716+9.625)

【答案】34.5;78.78;16.3

5650;213;5.284

【解析】

3.45×3.6+0.345×64 0.78×101 3.26×5.7-3.26×0.7

=3.45×3.6+3.45×6.4 =0.78×(100+1) =3.26×(5.7-0.7)

=3.45×(3.6+6.4) =0.78×100+0.78×1 =3.26×5

=3.45×10 =78+0.78 =16.3

=34.5 =78.78

56.5×99+56.5 1.25×213×0.8 19.625-(4.716+9.625)

=56.5×(99+1) =1.25×0.8×213 =19.625-9.625-4.716

=56.5×100 =1×213 =10-4.716

=5650 =213 =5.284

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