题目内容
简便运算
(1)(25+32)×4
(2)725+308+275+682
(3)125×9×16
(4)83×102
(5)25×(13×24)
(6)76×176-76×76-76.
(1)(25+32)×4
(2)725+308+275+682
(3)125×9×16
(4)83×102
(5)25×(13×24)
(6)76×176-76×76-76.
分析:(1)可根据乘法分配律计算;
(2)可根据加法交换律及结合律计算;
(3)可将16拆分为8×2后根据乘法交换律计算;
(4)可将102拆分为100+2后根据乘法分配律计算;
(5)可将24拆分为4×6后根据乘法交换律及结合律计算;
(6)可根据乘法分配律计算.
(2)可根据加法交换律及结合律计算;
(3)可将16拆分为8×2后根据乘法交换律计算;
(4)可将102拆分为100+2后根据乘法分配律计算;
(5)可将24拆分为4×6后根据乘法交换律及结合律计算;
(6)可根据乘法分配律计算.
解答:解:(1)(25+32)×4
=25×4+32×4,
=100+128,
=228;
(2)725+308+275+682
=(725+275)+(308+682),
=1000+990,
=1990;
(3)125×9×16
=125×9×8×2,
=125×8×9×2,
=1000×9×2,
=18000;
(4)83×102
=83×(100+2),
=83×100+83×2,
=8600+166,
=8766;
(5)25×(13×24)
=25×13×4×6,
=25×4×6×13,
=100×6×13,
=7800.
(6)76×176-76×76-76
=(176-76)×76-76,
=100×76-76,
=7600-76,
=7524.
=25×4+32×4,
=100+128,
=228;
(2)725+308+275+682
=(725+275)+(308+682),
=1000+990,
=1990;
(3)125×9×16
=125×9×8×2,
=125×8×9×2,
=1000×9×2,
=18000;
(4)83×102
=83×(100+2),
=83×100+83×2,
=8600+166,
=8766;
(5)25×(13×24)
=25×13×4×6,
=25×4×6×13,
=100×6×13,
=7800.
(6)76×176-76×76-76
=(176-76)×76-76,
=100×76-76,
=7600-76,
=7524.
点评:完成本题要注意分析式中数据的特点,然后运用合适的方法计算.
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