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简介:
一、类型1:一个数除以2、4、8
1、一个数÷2,就等于这个数×0.5
2、一个数÷4,就等于这个数×0.25
3、一个数÷8,就等于这个数×0.125
12.8×0.25+7.2÷4
=12.8×0.25+7.2×0.25
=(12.8+7.2)×0.25
=20×0.25
=5
3.3÷2+6.7×0.5
=3.3×0.5+6.7×0.5
=(3.3+6.7)×0.5
=10×0.5
=5
12.4÷4+87.6×0.25
=12.4×0.25+87.6×0.25
=(12.4+87.6)×0.25
=100×0.25
=25
3.3÷8+6.7×0.125
=3.3×0.125+6.7×0.125
=(3.3+6.7)×0.125
=10×0.125
=1.25