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\(\frac{60}{72}=\frac{60:12}{72:12}=\frac{5}{6}\)
\(\frac{70}{95}=\frac{70:5}{95:5}=\frac{14}{19}\)
\(\frac{150}{360}=\frac{150:30}{360:30}=\frac{5}{12}\)
Đáp án cần chọn là: A
2.9.52 22. − 72 = 2.3 2 .2 2 .13 2.11. − 2 3 .3 2 = 2 3 .3 2 .13 − 2 4 .3 2 .11 = 13 − 2.11 = − 13 22
\(\dfrac{60}{72}=\dfrac{60:12}{72:12}=\dfrac{5}{6}\\ \dfrac{70}{95}=\dfrac{70:5}{95:5}=\dfrac{14}{19}\\ \dfrac{150}{360}=\dfrac{150:30}{360:30}=\dfrac{5}{12}\)
\(\dfrac{72\times75}{125\times108}\) = \(\dfrac{36\times2\times25\times3}{25\times5\times36\times3}\) = \(\dfrac{2}{5}\)
a) 36 − 48 = − 3 4
b) − 15 50 = − 3 10
c) − 18 − 81 = 2 9
d) 145 215 = 29 43
a) \(-\frac{11}{18}\)
b)\(-\frac{3}{2}\)
c)\(\frac{49}{78}\)
d)\(\frac{23}{11}\)
e) \(\frac{11.12+22.24+44.48}{33.36+66.72+132.144}\)
\(=\frac{11.12+22.24+44.48}{11.3.12.3+22.3.3.24+44.3.348}\)
\(=\frac{11.12+22.24+44.48}{\left(1.12+22.24+44.48\right).9}\)
\(=\frac{1}{9}\)
72/180=72:36/1801:36=2/5
135/225=135:45/225:45=3/5
625/600=625:25/600:25=25/24
191919/373737=191919:10101/373737:10101=19/37
nhớ tick mình cái nha cả ngày nay ình chưa được cái nào
\(D=\frac{71.72+53}{71.53.10-18.10}\)
\(D=\frac{71.72+53}{10.\left(71.53-18\right)}\)
\(D=\frac{71.72+53}{10.\left(71.52+72-18\right)}\)
\(D=\frac{71.72+53}{10.\left(71.52+53\right)}\)
Sau đó bạn tự tính tiếp :))
\(D=\frac{71\cdot72+53}{530.71-180}\)
\(D=\frac{71\cdot72+53}{53.10\cdot71-180}\)
\(D=\frac{72+53}{53\cdot10-180}\)
\(D=\frac{72+53\cdot1}{53\cdot10-180}\)
\(D=\frac{72}{53\cdot\left(10-1\right)-9\cdot20}\)
\(D=\frac{72}{53\cdot9-9\cdot20}\)
\(D=\frac{72}{\left(53-20\right)\cdot9}\)
\(D=\frac{72}{33\cdot9}\)
\(D=\frac{72}{297}=\frac{8}{33}\)
=-2/3
\(\dfrac{-48}{72}=\dfrac{-48:24}{72:24}=\dfrac{-2}{3}\)