题目内容
脱式计算.
| 218-18+25×4 | 1300+450÷45 | (79+63÷3)×5 | 21×[(75+39)÷38]. |
(1)218-18+25×4
=200+100
=300
(2)1300+450÷45
=1300+10
=1310
(3)(79+63÷3)×5
=(79+21)×5
=100×5
=500
(4)21×[(75+39)÷38]
=21×(114÷38)
=21×3
=63
=200+100
=300
(2)1300+450÷45
=1300+10
=1310
(3)(79+63÷3)×5
=(79+21)×5
=100×5
=500
(4)21×[(75+39)÷38]
=21×(114÷38)
=21×3
=63
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