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a) \(2\left(x-5\right)-3\left(x+7\right)=14\)
\(\Leftrightarrow2x-10-3x-21=14\)
\(\Leftrightarrow-x-31=14\)
\(\Leftrightarrow-x=45\Leftrightarrow x=-45\)
b) \(5\left(x-6\right)-2\left(x+3\right)=12\)
\(\Leftrightarrow5x-30-2x-6=12\)
\(\Leftrightarrow3x-36=12\)
\(\Leftrightarrow3x=48\Leftrightarrow x=16\)
c) \(3\left(x-4\right)-\left(8-x\right)=12\)
\(\Leftrightarrow3x-12-8+x=12\)
\(\Leftrightarrow4x-20=12\)
\(\Leftrightarrow4x=32\Leftrightarrow x=8\)
d) \(-7\left(3x-5\right)+2\left(7x-14\right)=28\)
\(\Leftrightarrow-21x+35+14x-28=28\)
\(\Leftrightarrow-7x+35=0\Leftrightarrow x=5\)
\(360:12.2+\left\{\left(11-4\right)^3-343\right\}.2017^{2018}\)
\(=30.2+\left\{7^3-343\right\}.2017^{2018}\)
\(=60+\left\{343-343\right\}.2017^{2018}\)
\(=60+0.2017^{2018}\)
\(=60+0\)
\(=60\)
a) 3 - (-6/7)0 + (1/2)2 : 2
= 3 + 1 + 1/4 : 2
= 3 + 1 + 1/8
= 33/8
b) (-2)3 + 22 + (-1)20 + (-2)0
= (-8) + 4 - 1 - 1
= -6
c) [(3)2]2 - [(-5)2]2 - [(-2)3]2
= 81 - 625 - 64
= -608
d) 24 + 8.[(-2)2 : 1/2]0 - 2-2.4 + (-2)2
= 16 + 8.1 - 1/4.4 + 4
= 16 + 8 - 4 + 4
= 27
e) 23 + 3.(1/2)0 - 2-2.4 + [(-2)2 : 1/2].8
= 8 + 3 - 1/4.4 + 8.8
= 8 + 3 - 1 + 64
= 74
a) \(\left(8^{2019}-8^{2018}\right):\left(8^{2016}.8^2\right)\)
\(=8^{2018}\left(8-1\right):8^{2016+2}\)
\(=8^{2018}.7:8^{2018}=7\)
b) Em tham khảo link : Câu hỏi của ✽❤Girl cute❤✽ - Toán lớp 6 - Học toán với OnlineMath
a) \(\left(-\frac{1}{4}\right)^0=1\)
b) \(\left(-2\frac{1}{3}\right)^2=\left(-\frac{7}{3}\right)^2=\frac{49}{9}\)
c) \(\left(\frac{4}{5}\right)^{-2}=\frac{25}{16}\)
d) \(\left(0,5\right)^{-3}=8\)
e) \(\left(-1\frac{1}{3}\right)^4=\left(-\frac{4}{3}\right)^4=\frac{256}{81}\)
a, \(\left(\frac{-1}{4}\right)^0\) = 1
Bất kỳ số nguyên nào nếu có mũ bằng 0 đều bằng 1
b, \(\left(-2\frac{1}{3}\right)^2=\left(-\frac{7}{3}\right)^2=\frac{49}{9}\)
\(\left(20.2^4-12.2^3-48.2^2\right)^2:\left(-8^3\right)\)
\(=\left(20.16-12.8-48.4\right)^2:\left(-512\right)\)
\(=\left(320-96-192\right)^2:\left(-512\right)\)
\(=\left(224-192\right)^2:\left(-512\right)\)
\(=32^2:\left(-512\right)\)
\(=\left(32^2:-512\right)\)
\(=\left(1024:-512\right)\)
\(=-2\)
=-2 (âm hai)
mình nghĩ là nó đúng
k mình nha