题目内容
计算下面各题,能简便的用简便方法计算
5×(63×2) | 47+236+64 | 25×44 |
70×(56-27) | 300-162÷18 | (432+168)÷30. |
考点:整数四则混合运算,运算定律与简便运算
专题:运算顺序及法则
分析:(1)利用乘法交换律与结合律简算;
(2)利用减法结合律简算;
(3)把44=4×11计算;
(4)先算减法,再算乘法;
(5)先算除法,再算减法;
(6)先算加法,再算除法.
(2)利用减法结合律简算;
(3)把44=4×11计算;
(4)先算减法,再算乘法;
(5)先算除法,再算减法;
(6)先算加法,再算除法.
解答:
解:(1)5×(63×2)
=5×2×63
=10×63
=630;
(2)47+236+64
=47+(236+64)
=47+300
=347;
(3)25×44
=25×4×11
=100×11
=1100;
(4)70×(56-27)
=70×29
=2030;
(5)300-162÷18
=300-9
=291;
(6)(432+168)÷30
=600÷30
=20.
=5×2×63
=10×63
=630;
(2)47+236+64
=47+(236+64)
=47+300
=347;
(3)25×44
=25×4×11
=100×11
=1100;
(4)70×(56-27)
=70×29
=2030;
(5)300-162÷18
=300-9
=291;
(6)(432+168)÷30
=600÷30
=20.
点评:整数混合运算的关键是抓住运算顺序,正确按运算顺序计算,适当利用运算定律简算.
练习册系列答案
相关题目