题目内容
脱式计算(怎样简便怎样算)
(6105-435)÷14. 46.71-6.81-3.19 100-45÷0.9+0.75.
(6105-435)÷14. 46.71-6.81-3.19 100-45÷0.9+0.75.
分析:(1)先算小括号里面的减法,再算括号外的除法;
(2)根据连续减去两个数等于减去这两个数的和简算;
(3)先算除法,再算减法,最后算加法.
(2)根据连续减去两个数等于减去这两个数的和简算;
(3)先算除法,再算减法,最后算加法.
解答:解:(1)(6105-435)÷14,
=5670÷14,
=405;
(2)46.71-6.81-3.19,
=46.71-(6.81+3.19),
=46.71-10,
=36.71;
(3)100-45÷0.9+0.75,
=100-50+0.75,
=50+0.75,
=50.75.
=5670÷14,
=405;
(2)46.71-6.81-3.19,
=46.71-(6.81+3.19),
=46.71-10,
=36.71;
(3)100-45÷0.9+0.75,
=100-50+0.75,
=50+0.75,
=50.75.
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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