题目内容

请写出过程
①99×99+99
②10×0.1×100③8÷8÷0.125④37×39-29×37
⑤1.8÷2.7÷0.6×2.7⑥47×99⑦0.5+[数学公式÷(0.15+数学公式)]⑧[(数学公式+2.1)×数学公式]÷0.9.

解:①99×99+99,
=99×(99+1),
=99×100,
=9900;

②10×0.1×100,
=1×100,
=100;

③8÷8÷0.125,
=8÷(8×0.125),
=8÷1,
=8;

④37×39-29×37,
=37×(39-29),
=37×10,
=370;

⑤1.8÷2.7÷0.6×2.7,
=1.8÷0.6,
=3;

⑥47×99,
=47×(100-1),
=47×100-47,
=4700-47,
=4653;

⑦0.5+[÷(0.15+)],
=0.5+[÷(0.15+0.45)],
=0.5+(÷),
=+
=
=

⑧[(+2.1)×]÷0.9,
=(×+2.1×
=(+)×
=×+
=+
=
=1
分析:①④⑥利用乘法分配律简算;
③利用除法的性质简便运算;
其余题目按照运算顺序解答即可.
点评:灵活应用乘法分配律及其逆运算来解题,使计算更简单.
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