3.6×7/5 3.4÷5/7的简便运算
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解:3.6×7/5- 3.4÷5/7
=3.6×7/5- 3.4×7/5
=(3.6-3.4)×(7/5)
=0.2×(7/5)
=0.28
或
3.6×7/5+3.4÷5/7
=3.6×7/5+ 3.4×7/5
=(3.6+3.4)×7/5
=7×7/5
=49/5
=(50-1)/5
=10-0.2
=9.8
=3.6×7/5- 3.4×7/5
=(3.6-3.4)×(7/5)
=0.2×(7/5)
=0.28
或
3.6×7/5+3.4÷5/7
=3.6×7/5+ 3.4×7/5
=(3.6+3.4)×7/5
=7×7/5
=49/5
=(50-1)/5
=10-0.2
=9.8
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