题目内容
列竖式计算.(怎样简便就怎么算)
(1)316+278+184+222
(2)1659-488-659
(3)100-100÷50
(4)32×9-12×9.
(1)316+278+184+222
(2)1659-488-659
(3)100-100÷50
(4)32×9-12×9.
分析:(1)运用加法的交换律、结合律进行简算,
(2)先减去659,再减去488,
(3)先算除法,再算减法,
(4)运用乘法的分配律进行简算.
(2)先减去659,再减去488,
(3)先算除法,再算减法,
(4)运用乘法的分配律进行简算.
解答:解:(1)316+278+184+222,
=(316+184)+(222+278),
=500+500,
=1000;
(2)1659-488-659,
=1659-659-488,
=1000-488,
=512;
(3)100-100÷50,
=100-2,
=98;
(4)32×9-12×9,
=(32-12)×9,
=20×9,
=180.
=(316+184)+(222+278),
=500+500,
=1000;
(2)1659-488-659,
=1659-659-488,
=1000-488,
=512;
(3)100-100÷50,
=100-2,
=98;
(4)32×9-12×9,
=(32-12)×9,
=20×9,
=180.
点评:此题考查了整数四则混合运算的顺序,灵活运用运算定律进行简算即可.
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