脱式计算.(能简算的要简算)+++12.04-5.37-4.63++)×30;×[÷(×)]32×71.1+28.9×32(+)÷(÷4-)

发布时间:2020-08-04 15:07:11

脱式计算.(能简算的要简算) +++12.04-5.37-4.63++)×30;×[÷(×)]32×71.1+28.9×32(+)÷(÷4-)

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解:(1)+++,
=()+(),
=1+1,
=2;

(2)12.04-5.37-4.63,
=12.04-(5.37+4.63),
=12.04-10,
=2.04;

(3)(++)×30,
=×30+×30+×30,
=24+5+8,
=29+8,
=37;

(4)×[÷(×)],
=×[÷],
=,
=;

(5)32×71.1+28.9×32,
=(71.1+28.9)×32,
=100×32,
=3200;

(6)(+)÷(÷4-),
=(),
=,
=7.5.
解析分析:(1)运用加法交换律和结合律即可解答,(2)依据减法性质解答,(3)(5)运用乘法分配律解答,(4)(6)按照四则运算计算顺序解答.

点评:本题考查知识点:(1)四则运算计算顺序,(2)简便算法正确运用.
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