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2/3 + 7/1 = 2/3 + 7 = 2/3 + 21/3 = 23/3
25/48 + 11/24 = 25/48 + 22/48 = 47/48
5/7 + 3/8 = 40/56 + 21/56 = 61/56
15/24 + 12/6 = 5/8 + 2 = 5/8 + 16/8 = 21/8
5/6 + 4/3 = 5/6 + 8/6 = 13/6
3/8 + 7/12 = 9/24 + 14/24 = 23/24
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a: =9/12+8/12=17/12
b: =15/24+14/24=29/24
c: =4/25+15/25=19/25
a 3/4+8/12 =9/12+8/12=17/12
b 5/8 +14/24=15/24+14/24=29/24
c 4/25+3/5 =4/25+15/25=19/25
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a: =5/7+1/6
=30/35+7/35
=37/35
b: =5/8+3/4
=5/8+6/8
=11/8
c: =10/12+9/12
=19/12
d: =9/24+14/24
=23/24
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\((\)125-120\()\)x45
5x45=225
\(\dfrac{30x25x7x8}{75x8x12x14}\)=\(\dfrac{10\cdot1\cdot7\cdot1}{1\cdot1\cdot1\cdot12\cdot2}\)=\(\dfrac{70}{24}\)
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12/18 ... 1/3
12/18 ; 1/3 = 6/18
Vậy 12/18 > 6/18 hay 12/8 > 1/3
21/24 ...5/8
21/24 ; 5/8 = 15/24
Vậy 21/24 > 15/24 hay 21/24 > 5/8