题目内容
9.用递等式计算.24×25+26 | 129÷3-43 | (257-132)×8 |
540÷9×50 | 25×4×7 | (188+112)÷6 |
分析 (1)先算乘法,再算加法;
(2)先算除法,再算减法;
(3)先算减法,再算乘法;
(4)先算除法,再算乘法;
(5)按照从左到右的顺序计算;
(6)先算加法,再算除法.
解答 解:(1)24×25+26
=600+26
=626;
(2)129÷3-43
=43-43
=0;
(3)(257-132)×8
=125×8
=1000;
(4)540÷9×50
=60×50
=3000;
(5)25×4×7
=100×7
=700;
(6)(188+112)÷6
=300÷6
=50.
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即可.
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