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5(42)/(170) - 3(80)/(170)
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5(42)/(170) - 3(80)/(170)

User Mohnston
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5(42)/(170)-3(80)/(170)=(5-3)+\left((42)/(170)-(80)/(170)\right)\\\\=2+\left(-(38)/(170)\right)=2-(32)/(170)=1(170)/(170)-(38)/(170)\\\\=1(170-38)/(170)=1(132)/(170)=1(132:2)/(170:2)=1(66)/(85)



5(42)/(170)-3(80)/(170)=4(170+42)/(170)-3(80)/(170)\\\\=(4-3)+\left((212)/(170)-(80)/(170)\right)=1+(212-80)/(170)\\\\=1+(132)/(170)=1(132:2)/(170:2)=1(66)/(85)

User Chris Vasselli
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