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2/3 - 1/9 = 6/9 - 1/9 = 5/9
1/4 + 3/5= 5/20 + 12/20= 17/20
5/7 - 2/9= 45/63 - 14/63= 31/63
⅔ - 1/9 = 6/9 - 1/9 = 5/9
1/4 + 3/5 = 5/20 + 12/20 = 17/20
5/7 - 2/9 = 45/63 - 14/63 = 31/63
2/3-1/9=2*9,3*9,1*3,9*3=18/27-3/27=15/27
1/4+3/5=1*5,4*5,3*4,5*4=5/20+12/20=17/20
5/7-2/9=5*9,7*9,2*7,9*7=45/63-14/63=31/63