题目内容
| 用简便方法计算. 23+99 | 253-199 | 25×7×4 | 120÷6÷5. |
(1)23+99
=23+100-1
=123-1
=122;
(2)253-199
=253-200+1
=53+1
=54;
(3)25×7×4
=25×4×7
=100×7
=700;
(4)120÷6÷5
=120÷(6×5)
=120÷30
=4.
=23+100-1
=123-1
=122;
(2)253-199
=253-200+1
=53+1
=54;
(3)25×7×4
=25×4×7
=100×7
=700;
(4)120÷6÷5
=120÷(6×5)
=120÷30
=4.
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