Question

17分之5除以1又2分之1加3分之1除以3又5分之2 简便计算 5分之4乘以7.7加3.3乘以0.8减80％ 简便计算

Answer 1

17分之5除以1又2分之1加3分之1除以3又5分之2
=5/17*(2/3+1/3)
=5/17
5分之4乘以7.7加3.3乘以0.8减80％
=4/5*(7.7+3.3-1)
=4/5*10
=8
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Answer 2

5/17÷1又1/2+1/3÷3又2/5
=5/17×2/3+1/3×5/17
=5/17×（2/3+1/3）
=5/17×1
=5/17

4/5×7.7+3.3×0.8-80%
=0.8×7.7+3.3×0.8-0.8×1
=0.8×（7.7+3.3-1）
=0.8×10
=8