题目内容

13.脱式计算(怎样简便就怎样算)
9.36-2.54-1.46       256×35-35×57+35                 48.7-(4.9+8.7)
202×4524×97+72                          36×111+888×8

分析 (1)(3)根据减法的性质简算即可.
(2)(4)(5)(6)根据乘法的分配律简算即可.

解答 解:(1)9.36-2.54-1.46
=9.36-(2.54+1.46)
=9.36-4
=5.36

(2)256×35-35×57+35
=(256-57+1)×35
=200×35
=7000

(3)48.7-(4.9+8.7)
=48.7-8.7-4.9
=40-4.9
=35.1

(4)202×45
=(200+2)×45
=200×45+2×45
=9000+90
=9090

(5)24×97+72
=24×(100-3)+72
=2400-72+72
=2400

(6)36×111+888×8
=36×111+111×64
=(36+64)×111
=100×111
=11100

点评 完成本题要注意分析式中数据,运用合适的简便方法计算.

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