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a: 78/42-4/7=13/7-4/7=9/7
100/110-56/88=10/11-7/11=3/11
75/35-11/7+21/49=15/7-11/7+3/7=7/7=1
99/72-15/40-1212/1616=11/8-3/8-3/4=1-3/4=1/4
![](https://rs.olm.vn/images/avt/0.png?1311)
+)\(\frac{100}{110}=\frac{10}{11}\)
+)\(\frac{56}{88}=\frac{7}{11}\)
\(\Rightarrow\)\(\frac{100}{110}-\frac{56}{88}=\frac{10}{11}-\frac{7}{11}\)
\(=\frac{3}{11}\)
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a) 27 / 36 = 27 : 9 / 36 : 9 = 3/4
b) 72/96 = 72 : 24 / 96 : 24 = 3/4
c) 55 / 110 = 55 : 55 / 110 : 55 = 1/2
d) 88 / 99 = 88 : 11 / 99 : 11 = 8/9
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A;18/27=2/3;24/56=3/7
Vay2/3<3/7
B36/90=2/5;50/125=2/5
2/5=2/5
C121/77=11/7;88/64=11/8
vai11/7co mau be hon 11/8 ma tu bang nhau nen
11/7>11/8
D52/91=4/7,60/84=5/7
phan so co mau bang nhau tu cua 5/7 lon hon4/7 nen 4/7<5/7
tich nha
100/110=10/11
56/88=7/11
10/11-7/11
=3/11
Đổi 100/110=10/11,56/88=7/11
10/11-7/11=3/11
Đ/s:3/11