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\(5+\frac{x}{8}=\frac{14}{16}\)
\(\frac{x}{8}=\frac{14}{16}-5\)
\(\frac{x}{8}=-\frac{33}{6}\)
\(\Rightarrow6x=-33\times8\)
\(\Rightarrow6x=-264\)
\(\Rightarrow x=-44\)
Vậy \(x=-44\)
\(5+\frac{x}{8}=\frac{5}{1}+\frac{x}{8}=\frac{40}{8}+\frac{x}{8}\)\(=\frac{14}{16}=\frac{7}{8}\)
Vay \(\frac{x}{8}=\frac{7}{8}-\frac{40}{8}=\)...............tự làm tiếp
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\(pt\Leftrightarrow\frac{10+2x}{16}=\frac{14}{16}\Leftrightarrow10+2x=14\Leftrightarrow2x=14-10=4\)
\(\Leftrightarrow x=2\)
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11 x 12 + 12 x 13 + 13 x 14 + 14 x 15 + 15 x 16 + 16 x 17 + 17 x 18 + 18 x 19 + 19 x 20 + 20 x 21
= 12 x ( 11 + 13 ) + 14 x ( 13 + 15 ) + 16 x ( 15 + 17 ) + 18 x ( 17 + 19 ) + 20 x 21
= 12 x 24 + 14 x 28 + 16 x 32 + 18 x 36 + 420
= 288 + 392 + 512 + 648 + 420
= ( 288 + 392 ) + ( 512 + 648 ) + 420
= 680 + 1160 + 420
= 1840 + 420
= 2260
tk nha
=
Ta có:
11 x 12 + 12 x 13 + 13 x 14 + 14 x 15 + 15 x 16 + 16 x 17 + 17 x 18 + 18 x 19 + 19 x 20 + 20 x 21
= 12 x ( 11 + 13 ) + 14 x ( 13 + 15 ) + 16 x ( 15 + 17 ) + 18 x ( 17 + 19 ) + 20 x 21
= 12 x 24 + 14 x 28 + 16 x 32 + 18 x 36 + 420
= 288 + 392 + 512 + 648 + 420
= ( 288 + 392 ) + ( 512 + 648 ) + 420
= 680 + 1160 + 420
= 1840 + 420
= 2260
#Mạt Mạt#
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\(14,P=x^2+xy+y^2-3x-3y+3\\ P=\left(x^2+xy+\dfrac{1}{4}y^2\right)-3\left(x+\dfrac{1}{2}y\right)+\dfrac{3}{4}y^2-\dfrac{3}{2}y+3\\ P=\left(x+\dfrac{1}{2}y\right)^2-3\left(x+\dfrac{1}{2}y\right)+\dfrac{9}{4}+\dfrac{3}{4}\left(y^2-2y+1\right)\\ P=\left(x+\dfrac{1}{2}y-\dfrac{3}{2}\right)^2+\dfrac{3}{4}\left(y-1\right)^2\ge0\)
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3,6 x X = 403,2 : 14
3,6 x X = 28,8
X = 28,8 : 3,6
X = 8
45,54 : x = 18 : 5
45,54 : x = 3,6
x = 45,54 : 3,6
x = 12.65
5+x/18=14/16
5+x/18= 7/8
x=43/4
x=-74,25