脱式计算(能简算的要简算).
(1)99×99+99????
(2)
(3)8÷8÷0.125
(4)37×39-29×37
(5)1.8÷2.7÷0.6×2.7
(6).
网友回答
解:(1)99×99+99,
=99×(99+1),
=99×100,
=9900;
(2),
=[2.25×]÷0.9,
=×,
=;
(3)8÷8÷0.125,
=1÷0.125,
=8;
(4)37×39-29×37,
=37×(39-29),
=37×10,
=370;
(5)1.8÷2.7÷0.6×2.7,
=1.8×××2.7,
=(1.8×)×(2.7×),
=3×1,
=3;
(6),
=0.5+[÷],
=0.5+,
=.
解析分析:(1)、(4)可以运用乘法分配律简算,(5)现变成乘法,再运用乘法结合律简算;其它题目按照先算乘除,再算加减,有括号的先算括号里面的运算顺序计算.
点评:运用运算定律来计算是常用的简算方法,要熟练掌握,灵活运用.