В). 75 8/15 - 12 7/30 = (75 - 12) + (8/15 - 7/30) = 63 + 3/10 = 63 3/10
Е). 12 1/9 - 8 16/21 = 109/9 - 184/21 = 211/63 = 3 22/63
З). 6 121/360 - 2 123/144 = 2281/360 - 411/144 = 2507/720 = 3 347/720
К). 19 9/11 - 7 11/13 = 218/11 - 102/13 = 1712/143 = 11 139/143
Н). 25/27 - 103/216 = 200 - 103/216 = 97/216
У). 7 7/60 - 2 125/246 = 427/60 - 617/246 = 3779/820= 4 499/820
Ч). 3/4 + 12 2/5 + 21 17/30 + 19 17/60 = 3/4 + 62/5 + 647/30 + 1157/60 = 54
/ - дробная черта.
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Answers & Comments
В). 75 8/15 - 12 7/30 = (75 - 12) + (8/15 - 7/30) = 63 + 3/10 = 63 3/10
Е). 12 1/9 - 8 16/21 = 109/9 - 184/21 = 211/63 = 3 22/63
З). 6 121/360 - 2 123/144 = 2281/360 - 411/144 = 2507/720 = 3 347/720
К). 19 9/11 - 7 11/13 = 218/11 - 102/13 = 1712/143 = 11 139/143
Н). 25/27 - 103/216 = 200 - 103/216 = 97/216
У). 7 7/60 - 2 125/246 = 427/60 - 617/246 = 3779/820= 4 499/820
Ч). 3/4 + 12 2/5 + 21 17/30 + 19 17/60 = 3/4 + 62/5 + 647/30 + 1157/60 = 54
/ - дробная черта.