题目内容
脱式计算:
| 2000-45×24+96 | (1254-78×12)×53 | (640÷4)×(78+12) | 42×85+42×15 |
| 28×28+13×26 | 30×(234÷9) | 18×(313-259) | 16×17+398. |
(1)2000-45×24+96
=2000-1080+96
=920+96
=1016;
(2)(1254-78×12)×53
=(1254-936)×53
=318×53
=16854;
(3)(640÷4)×(78+12)
=160×90
=14400;
(4)28×28+13×26
=784+338
=1122;
(5)30×(234÷9)
=30×26
=780;
(6)18×(313-259)
=18×54
=972.
=2000-1080+96
=920+96
=1016;
(2)(1254-78×12)×53
=(1254-936)×53
=318×53
=16854;
(3)(640÷4)×(78+12)
=160×90
=14400;
(4)28×28+13×26
=784+338
=1122;
(5)30×(234÷9)
=30×26
=780;
(6)18×(313-259)
=18×54
=972.
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