y nhân 23 cộng 17 bằng 3122
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12345x17+23x12345+12345+12345x35+12345x24
=12345x17+23x12345+12345x1+12345x35+12345x24
=12345x(17+23+1+35+24)
=12345x100
=1234500
k cho minh nha
12345*17+23*12345+12345*35+12345*24
=12345*(17+23+35+34)
=12345*109
=1345605
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213x37 + 213x39 + 23x213 + 213
= 213x37 + 213x39 + 23x213 + 213x1
= 213 x ( 37 + 23 ) + ( 39 + 1 )
= 213 x 60 + 40
= 213 x100
= 21300
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a*x+a*y+b*x+b*y
= a*(x+y)+b*(x+y)
= a*(-17)+b*(-17) (vì x+y=-17)
=(-17)*(a+b)
=(-17)*(-2) (vì a+b=-2)
=34
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\(54:3^1+6.5^2\)
\(=54:3+6.25\)
\(=18+150\)
\(=168\)
\(---------\)
\(11-13+15-17+19-21+23-25\)
\(=\left(11-13\right)+\left(15-17\right)+\left(19-21\right)+\left(23-25\right)\)
\(=\left(-2\right)+\left(-2\right)+\left(-2\right)+\left(-2\right)\)
\(=\left(-2\right).4\)
\(=-8\)
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\(\frac{5}{9}\times\frac{8}{17}+\frac{4}{9}\times\frac{8}{17}\)
\(=\left(\frac{5}{9}+\frac{4}{9}\right)\times\frac{8}{17}\)
\(=1\times\frac{8}{17}\)
\(=\frac{8}{17}\)
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Đề cụ thể là : 5 * x + 2 + 3 * ( x - 1 ) = 23
Ta có x = 3
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\(\frac{5}{5}x\)\(\frac{17}{21}+\frac{17}{21}x\)\(\frac{2}{5}\)
=(\(\frac{5}{5}+\frac{2}{5}\)) x\(\frac{17}{21}\)
=\(\frac{7}{5}x\)\(\frac{17}{21}\)
\(\frac{119}{105}\)
y=(3122-17):23=135
nhớ k mình nha
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