题目内容
| 用递等式计算,能简算的要简算. 135÷27+12×4 | 1620-1320÷60+80 |
| (85+14×5)÷5 | 520÷[13×(43-33)] |
| 490÷[210÷(360÷12)] | [160-(75+38)]×107 |
| 45+61+39+55 | 25×5×4×2 |
| 125×(8×5)×7. |
(1)135÷27+12×4,
=5+48,
=53;
(2)1620-1320÷60+80,
=1620-22+80,
=1598+80,
=1678;
(3)(85+14×5)÷5,
=(85+70)÷5,
=155÷5,
=31;
(4)520÷[13×(43-33)],
=520÷[13×10],
=520÷130,
=4;
(5)490÷[210÷(360÷12)],
=490÷[210÷30],
=490÷7,
=70;
(6)[160-(75+38)]×107,
=[160-113]×107,
=47×107,
=5029;
(7)45+61+39+55,
=(45+55)+(61+39),
=100+100,
=200;
(8)25×5×4×2,
=(25×4)×(5×2),
=100×10,
=1000;
(9)125×(8×5)×7,
=(125×8)×(5×7),
=1000×35,
=35000.
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