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) |
(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.
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