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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