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KQ là \(-\frac{61}{16}\)
mk ko bít bạn có cần lời giải ko mk chỉ vít kq hoi
có j nếu cần lời giải ns mk ha
\(4\frac{25}{16_{ }}+25.\left(\frac{9}{16}-\frac{117}{64}\right):\frac{27}{8}\)
=\(\frac{25}{4}+25.\left(\frac{36}{64}-\frac{117}{64}\right):\frac{27}{8}\)
=\(\frac{25}{4}+25.\left(\frac{-81}{64}\right):\frac{28}{7}\)
=\(\frac{25}{4}+\left(\frac{-2025}{64}\right).\frac{7}{28}\)
=\(\frac{25}{4}+\left(\frac{-2025}{256}\right)\)
=\(\frac{1600}{256}-\frac{2025}{256}\)
=\(\frac{-425}{256}\)
bn xem có đúng k nhé!
mik làm được mỗi ý b thui :
b ) \(\frac{169}{10}=16,9\)
mik nha
phần đầu bằng -6675/128
phần sau bằng 13
bạn dùng máy tính là được mà
=\(\frac{89}{15}+25(-\frac{81}{64}):\frac{27}{8}\)
=\(\frac{89}{15}+(-\frac{2025}{64}):\frac{27}{8} \)
=\(\frac{89}{15}+(-\frac{75}{8})\)
=\(-\frac{89}{24}\)
\(\frac{89}{15}\)+ 25 \((\) \(\frac{36}{64}\)\(-\)\(\frac{117}{64}\)\()\). \(\frac{8}{27}\)
= \(\frac{89}{15}\)+ 25 \((\)\(\frac{-81}{64}\)\()\)\(\frac{8}{27}\)
= \(\frac{89}{15}\)+ 25 . \((\)\(\frac{-3}{8}\)\()\)
= \(\frac{89}{15}\)+ \(\frac{-75}{8}\)
= \(\frac{-413}{120}\)
Nếu đúng cho mình xin 1 k nhé
5 / 16 :0 , 125 + 1 , 456 : 7 / 25 + 4 1/2 . 0 , 8
= 5 / 16 : 1 / 8 + 1,456 : 7 / 25 + 9 / 2 . 4 / 5
= 5 / 2 + 26 / 5 + 18 / 5
= 113 / 10
Bài 1:
a) \(-\frac{4}{5}-\frac{8}{25}\left(\frac{-5}{2}-0,125\right)\\ =-\frac{4}{5}-\frac{8}{25}\left(\frac{-5}{2}-\frac{1}{8}\right)\\ =-\frac{4}{5}-\frac{8}{25}\left(\frac{-20}{8}-\frac{1}{8}\right)\\ =-\frac{4}{5}-\frac{8}{25}\cdot\frac{-21}{8}\\ =-\frac{4}{5}-\frac{-21}{25}\\ =\frac{-4}{5}+\frac{21}{25}\\ =\frac{-20}{25}+\frac{21}{25}=\frac{1}{25}\)
c) \(5\frac{1}{2}-4\frac{2}{3}:\frac{16}{9}-3\frac{1}{3}:\frac{16}{9}\\ =5\frac{1}{2}-\left(4\frac{2}{3}:\frac{16}{9}+3\frac{1}{3}:\frac{16}{9}\right)\\ =5\frac{1}{2}-\left(4\frac{2}{3}+3\frac{1}{3}\right):\frac{16}{9}\\ =5\frac{1}{2}-8\cdot\frac{9}{16}\\ =\frac{11}{2}-\frac{9}{2}=\frac{2}{2}=1\)
Bài 2:
a) \(\left(20\%x+\frac{2}{5}x-2\right):\frac{1}{3}=-2013\\ \left(\frac{1}{5}x+\frac{2}{5}x-2\right)\cdot3=-2013\\ \left[x\left(\frac{1}{5}+\frac{2}{5}\right)-2\right]=\left(-2013\right):3\\ x\cdot\frac{3}{5}-2=-671\\ x\cdot\frac{3}{5}=-671+2\\ x\cdot\frac{3}{5}=-669\\ x=\left(-669\right):\frac{3}{5}\\ x=\left(-669\right)\cdot\frac{5}{3}\\ x=-1115\)Vậy x = -1115
b) \(\left(4,5-2\left|x\right|\right)\cdot1\frac{4}{7}=\frac{11}{14}\\ \left(\frac{9}{2}-2\left|x\right|\right)\cdot\frac{11}{7}=\frac{11}{14}\\ \frac{9}{2}-2\left|x\right|=\frac{11}{14}:\frac{11}{7}\\ \frac{9}{2}-2\left|x\right|=\frac{11}{14}\cdot\frac{7}{11}\\ \frac{9}{2}-2\left|x\right|=\frac{1}{2}\\ 2\left|x\right|=\frac{9}{2}-\frac{1}{2}\\ 2\left|x\right|=4\\ \left|x\right|=4:2\\ \left|x\right|=2\\ \Rightarrow\left[{}\begin{matrix}x=2\\x=-2\end{matrix}\right.\)Vậy x ∈ {2 ; -2}
8/5:(8/5.5/4) / 16/25-1/25 + 1:4/7 / (50/9-9/4).36/17) + 0,6.0,5:2/5
= 8/5:8/5:5/4 / 3/5 + 7/4 / 50/9.36/17-9/4.36/17 + 0,3.5/2
= 4/5:3/5 + 7/4 / 200/17-81/17 + 3/10.5/2
= 4/5.5/3 + 7/4 / 119/17 + 3/4
= 4/3 + 7/4 : 7 + 3/4
= 4/3 + 4 + 3/4
= 16/12 + 48/12 + 9/12
= 73/12
☆★☆★☆
a) \(\frac{-61}{16}\)
b) -360
c) 11,3