题目内容

【题目】

简算

6.4÷+1.25×3 88×. 6×99+6.6.

【答案】(1)6.4÷+1.25×3

=6.4×+1.25×3.6,

=6.4×1.25+1.25×3.6,

=1.25×(6.4+3.6),

=1.25×10,

=12.5;

(2)88×

=(87+1)×

=87×+1×

=52+

=52

(3)6×99+6.6,

=6×99+6×1.1,

=6×(99+1.1),

=6×100.1,

=6×(100+0.1),

=600+0.6,

=600.6.

【解析】

试题分析:(1)把除法改为乘法,再把分数化为小数,然后运用乘法分配律简算;

(2)把88看作87+1,运用乘法分配律简算;

(3)把6.6看作6×1.1,运用乘法分配律简算.

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