能简算的要简算(25%+3/5)÷(1-66%)

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能简算的要简算(25%+3/5)÷(1-66%)

能简算的要简算(25%+3/5)÷(1-66%)
能简算的要简算(25%+3/5)÷(1-66%)

能简算的要简算(25%+3/5)÷(1-66%)
(25%+3/5)÷(1-66%)
=(1/4 + 3/5) ÷(1- 33/50)
=(5/20 + 12/20)÷(17/50)
=17/20 ×(50/17)
=5/2
(=2又1/2)

=(1/4+3/5)/(0.34)=(17/20)/(17/50)=50/20=5/2

(25%+3/5)÷(1-66%)
=(1/4+3/5)÷34%
=(1/4+3/5)×100/34
=25/34+60/34
=85/34
=5/2
=2.5

原式=(1/4+3/5)/(0.34)=(17/20)/(17/50)=50/20=5/2