=(7/8-1/4):(5/6-3/4)^2
=(7/8-2/8):(10/12-9/12)^2
=5/8-(1/12)^2
=5/8-1/144
=90/144-1/144
=89/144
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Các câu hỏi tương tự
tính
A( \(\dfrac{7}{8}-0,25\) ) \(:\left(\dfrac{5}{6}-0,75\right)^2\)
B) \(\dfrac{3}{4}.1\dfrac{4}{9}-\left(\dfrac{-3}{4}\right)\)
Tính:
a/\(A=\left(-0,75-\dfrac{1}{4}\right):\left(-5\right)+\dfrac{1}{48}-\left(\dfrac{-1}{6}\right):\left(-3\right)\)
b/\(B=\left(\dfrac{6}{25}-1,24\right):\dfrac{3}{7}:\left[\left(3\dfrac{1}{2}-3\dfrac{2}{3}\right):\dfrac{1}{14}\right]\)
Tính giá trị các biểu thức sau (hợp lí nếu có thể):
a) \(\dfrac{8^5.\left(-5\right)^8+\left(-2\right)^5,10^9}{2^{16}.5^7+20^8}\)
b) \(\dfrac{\left(-0,25\right)^{-5}.9^4.\left(-2\right)^{-3}-2^{-2}.6^9}{2^9.3^6+6^6.40}\)
\(\left(\dfrac{-9}{13}\right)\left(\dfrac{-4}{5}\right)\)
\(-0,7:\dfrac{3}{2}\)
\(\dfrac{7}{6}.3\dfrac{1}{4}+\dfrac{7}{6}.\left(-0,25\right)\)
\(\left(-0,75.x+\dfrac{5}{2}\right).\dfrac{4}{7}-\left(-\dfrac{1}{3}\right)=\dfrac{-5}{6}\)
\(\left(\dfrac{-4}{3}+\dfrac{5}{13}\right)\div\dfrac{2}{7}-\left(\dfrac{9}{4}+\dfrac{8}{13}\right)\div\dfrac{2}{7}\)
1, Tính hợp líAdfrac{0.5+dfrac{7}{12}-dfrac{5}{6}}{1-dfrac{2}{3}+0,75}B-66.left(dfrac{1}{2}-dfrac{1}{3}+dfrac{1}{11}right)+124.left(-37right)+126.left(-62right)Nleft(60dfrac{7}{13}+50dfrac{8}{13}-11.dfrac{2}{13}right)x (Với x-2017dfrac{7}{10})Mleft(1-dfrac{2}{2.3}right).left(1-dfrac{2}{3.4}right).left(1-dfrac{2}{4.5}right).....left(1-dfrac{2}{99.100}right)
Đọc tiếp
1, Tính hợp lí
\(A=\dfrac{0.5+\dfrac{7}{12}-\dfrac{5}{6}}{1-\dfrac{2}{3}+0,75}\)
\(B=-66.\left(\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{11}\right)+124.\left(-37\right)+126.\left(-62\right)\)
\(N=\left(60\dfrac{7}{13}+50\dfrac{8}{13}-11.\dfrac{2}{13}\right)x\) (Với \(x=-2017\dfrac{7}{10}\))
\(M=\left(1-\dfrac{2}{2.3}\right).\left(1-\dfrac{2}{3.4}\right).\left(1-\dfrac{2}{4.5}\right).....\left(1-\dfrac{2}{99.100}\right)\)
12 tháng 9 2021 lúc 14:14
1. a) \(\dfrac{5}{3}+\dfrac{-2}{7}-\left(-1,2\right)\)
b) \(0,25+\dfrac{3}{5}-\left(\dfrac{1}{8}-\dfrac{2}{5}+1\dfrac{1}{4}\right)\)
Giúp mình với 
\(10\dfrac{1}{4}\div\left(\dfrac{-3}{5}\right)-8\dfrac{1}{4}\div\left(\dfrac{-3}{5}\right)\) tính