问题 解答题

用简便方法计算.

72×53+41×24

981+5×9810+49×981.

答案

(1)72×53+41×24

=24×3×53+41×24,

=24×159+41×24,

=24×(159+41),

=24×200,

=4800;

(2)981+5×9810+49×981

=981+5×981×10+49×981,

=981×(1+50+49),

=981×100,

=98100.

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