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M=4(x+y)+21xy(x+y)+7x2y2(x+y)+2014
M=4.0+21xy.0+7x2y2.0+2014
M=0+0+0+2014=2014
nhớ
ko cho ko đâu
a)
x : ( -3/5 )^2 = ( -3/5 )
x = (-3/5)^3
x = -27/125
b)
(4/7)^4 . x = ( 4/7 )^6
x = (4/7)^6 : (4/7)^4
x = (4/7)^2
x = 16/49
a. x : \(\left(-\frac{3}{5}\right)^2\)= \(-\frac{3}{5}\)
x = \(-\frac{3}{5}.\left(-\frac{3}{5}\right)^2\)
x = \(\left(-\frac{3}{5}\right)^3\)
b. \(\left(\frac{4}{7}\right)^4.\)x = \(\left(\frac{4}{7}\right)^6\)
x = \(\left(\frac{4}{7}\right)^6:\left(\frac{4}{7}\right)^4\)
x = + \(\left(\frac{4}{7}\right)^2\)
a, 3 : ( 1 - 3/2x ) = 4 : ( 2 - x )
<=> \(\frac{3}{1-\frac{3}{2}x}=\frac{4}{2-x}\)
<=> 3 ( 2 - x ) = 4 ( 1 - 3/2x )
<=> 6 - 3x = 4 - 6x
<=> -3x + 6x = 4 - 6
<=> 3x = -2
<=> x = -2/3
b, 2.3x + 3x-1 = 7( 32 + 2.62 )
b, 2.3x + 3x-1 = 7( 32 + 2.62 )
<=> 2.3x + 3x-1 = 7.81
<=> 3x-1(2.3 + 1) = 7.81
<=> 3x-1.7 = 7.81
<=> 3x-1=81
<=> 3x-1 = 34
=> x - 1 = 4 => x = 5
b) 2(x+1)+42=24
2(x+1)+16=16
2(x+1) = 16-16
2(x+1) = 0
x+1=2x0
x+1=0
x=0-1
x = -1
a, => 2x+5-x+7=18
=>x+12=18
=>x=6
b, =>2(x+1)=0
=>x+1=0
=>x=-1
c, \(\frac{x-3}{x+5}=\frac{5}{7}\Rightarrow7\left(x-3\right)=5\left(x+5\right)\Rightarrow7x-21=5x+25\Rightarrow7x-5x=25+21\Rightarrow2x=46\Rightarrow x=23\)
2x + 5 - ( x - 7 ) = 18
2x + 5 - x + 7 = 18
x = 18 -12=6
2( x + 1 ) +42 = 24
2x + 2 =0
x = -1
\(x-\frac{3}{x}+5=\frac{5}{7}\)
\(\frac{x^2-3}{x}=\frac{-30}{7}\)
\(7x^2-21=-30x\)
\(7x^2+30x-21=0\)
\(x=0,612471646\)