题目内容
+÷ | |
2- | (0.75-)×(+0.3) |
解:(1),
=,
=,
=;
(2),
=,
=,
=×1,
=;
(3),
=,
=2-(+),
=2-1,
=1;
(4)
=0.25×0.5,
=0.125.
分析:(1)先算除法,再算乘法,最后算加法;
(2)根据乘法分配律进行简算;
(3)先算除法,再根据连减的性质进行简算;
(4)先算小括号里面的加法和加法,再算乘法.
点评:四则运算,先弄清运算顺序,然后再进一步计算即可,能简算的要简算.
=,
=,
=;
(2),
=,
=,
=×1,
=;
(3),
=,
=2-(+),
=2-1,
=1;
(4)
=0.25×0.5,
=0.125.
分析:(1)先算除法,再算乘法,最后算加法;
(2)根据乘法分配律进行简算;
(3)先算除法,再根据连减的性质进行简算;
(4)先算小括号里面的加法和加法,再算乘法.
点评:四则运算,先弄清运算顺序,然后再进一步计算即可,能简算的要简算.
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