题目内容
用递等式计算. 25×24+125 |
23×34-152 |
(21-19)×38 | 320+26×27 |
1500-125×8 | 20×(35-14) |
分析:(1)(4)先算乘法,再算加法;
(2)(5)先算乘法,再算减法;
(3)(6)先算小括号里面的减法,再算乘法.
(2)(5)先算乘法,再算减法;
(3)(6)先算小括号里面的减法,再算乘法.
解答:解:(1)25×24+125
=600+125
=725;
(2)23×34-152
=782-152
=630;
(3)(21-19)×38
=2×38
=76;
(4)320+26×27
=320+702
=1022;
(5)1500-125×8
=1500-1000
=500;
(6)20×(35-14)
=20×21
=420.
=600+125
=725;
(2)23×34-152
=782-152
=630;
(3)(21-19)×38
=2×38
=76;
(4)320+26×27
=320+702
=1022;
(5)1500-125×8
=1500-1000
=500;
(6)20×(35-14)
=20×21
=420.
点评:计算注意抓住运算顺序,按照运算顺序正确计算每一步即可.
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