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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
\(pt\Leftrightarrow\frac{10+2x}{16}=\frac{14}{16}\Leftrightarrow10+2x=14\Leftrightarrow2x=14-10=4\)
\(\Leftrightarrow x=2\)
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#
\(14,P=x^2+xy+y^2-3x-3y+3\\ P=\left(x^2+xy+\dfrac{1}{4}y^2\right)-3\left(x+\dfrac{1}{2}y\right)+\dfrac{3}{4}y^2-\dfrac{3}{2}y+3\\ P=\left(x+\dfrac{1}{2}y\right)^2-3\left(x+\dfrac{1}{2}y\right)+\dfrac{9}{4}+\dfrac{3}{4}\left(y^2-2y+1\right)\\ P=\left(x+\dfrac{1}{2}y-\dfrac{3}{2}\right)^2+\dfrac{3}{4}\left(y-1\right)^2\ge0\)
( x + 1 ) + ( x + 3 ) + ( x + 5 ) + ( x + 7 ) + ( x + 9 ) + ( x + 11 ) + ( x + 13 ) = 119
( x + x + x + x + x + x + x ) + ( 1 + 3 + 5 + 7 + 9 + 11 + 13 ) = 119
7x + 49 = 119
7x = 119 - 49
7x = 70
x = 70 : 7
x = 10
\(22+\frac{x}{49}=\frac{5}{7}\)
=>\(\frac{x}{49}=\frac{5}{7}-22\)
\(\Rightarrow\frac{x}{49}=-\frac{149}{7}\)
\(\Rightarrow x=-\frac{149}{7}\cdot49\)
\(\Rightarrow x=-1043\)
22 + \(\frac{X}{49}\)= \(\frac{5}{7}\)
\(\frac{X}{49}\)= 22 - \(\frac{5}{7}\)= \(\frac{149}{7}\)
X = \(\frac{149}{7}\)X 49
X = 1043
5+x/18=14/16
5+x/18= 7/8
x=43/4
x=-74,25