题目内容
用简便方法计算.
(1)63.3×101
(2)55.2-1.375-2.625
(3)98×0.24+17.6×98.
(1)63.3×101
(2)55.2-1.375-2.625
(3)98×0.24+17.6×98.
分析:(1)把101看作100+1,运用乘法分配律简算;
(2)运用减法的性质简算;
(3)运用乘法分配律简算.
(2)运用减法的性质简算;
(3)运用乘法分配律简算.
解答:解:(1)63.3×101,
=63.3×(100+1),
=63.3×100+63.3,
=6330+63.3,
=6393.3;
(2)55.2-1.375-2.625,
=55.2-(1.375+2.625),
=55.2-4,
=51.2;
(3)98×2.4+17.6×98,
=(2.4+17.6)×98,
=20×98,
=1960.
=63.3×(100+1),
=63.3×100+63.3,
=6330+63.3,
=6393.3;
(2)55.2-1.375-2.625,
=55.2-(1.375+2.625),
=55.2-4,
=51.2;
(3)98×2.4+17.6×98,
=(2.4+17.6)×98,
=20×98,
=1960.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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