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\(a,78-\left(x-3\right)=16\)
\(78-x+3=16\)
\(51-x=16\)
\(x=51-16=35\)
\(b,\left(2x+3\right):4=60\)
\(2x+3=60\cdot4=240\)
\(2x=240-3=237\)
\(x=\frac{237}{2}\)
\(c,\left(2x-8\right)=\left(2x-8\right)^7\)
\(\left(2x-8\right)-\left(2x-8\right)^7=0\)
Để mik nghĩ thêm tí r làm tiép
Để tui làm nốt ý C cho !!!
( 2x - 8 ) = ( 2x - 8 )7
=> ( 2x - 8 ) . 1 - ( 2x - 8 ) . ( 2x - 8 )6 = 0
=> ( 2x - 8 ) . [ 1 - ( 2x - 8 )6 ] = 0
=> 1 - ( 2x - 8 )6 = 0
=> ( 2x - 8 )6 = 1
=> ( 2x - 8 )6 = ( 16 )
\(\Rightarrow\orbr{\begin{cases}2x-8=1\\2x-8=-1\end{cases}\Rightarrow\orbr{\begin{cases}2x=9\\2x=7\end{cases}\Rightarrow}\orbr{\begin{cases}x=\frac{9}{2}\\x=\frac{7}{2}\end{cases}}}\)
Vậy ........
72 . x - 14 . x = 72 . 10 - 70
49 . x - 14 . x = 49 . 10 - 70
( 49 - 14 ) . x = 490 - 70
35 . x = 420
x = 420 : 35
x = 12
72 . x -14 . x = 420
( 72 - 14 ) . x = 420
35 . x = 420
x = 420 : 35
x= 12
\(16+\left(-6\right)+\left(-8\right)+7\)\(=16-6-8+7\)\(=\left(16-6\right)-\left(8-7\right)\)\(=10-1=9\)
\(\left(-8\right)-[\left(2015^0\right)-14+7]\)\(=-8-\left(1-14+7\right)\)\(=-8-\left(-6\right)=-2\)
\(\left(-31\right)-[82-\left(-17\right)]\)\(=-31-\left(82+17\right)\)\(=-31-99=-130\)
\(6\left(-2\right)^3+5\left(-4\right)-\left(-12\right)\)\(=6\left(-8\right)+\left(-20\right)+12\)\(=-48-20+12=-56\)
2X-11 = 9 x 15 + 208
=> 2x = 135 + 208 + 11
=> 2x = 354
=> x = 177
Vậy x = 177
2x+2 - 2x = 96
2x . 22 - 2x . 1 = 96
2x . ( 22 - 1 ) = 96
2x . 3 = 96
2x = 32
2x = 25
=> x = 5
hok tốt
a: 22.x+32.x=39 b: 42.x-32.x=49
=> (4+9).x=39 =>(16-9).x=49
=>13.x=39 =>7.x=49 NHỚ CHO ANH NHA:) <3
=>x=39:13 =>x=49:7
=>x=3 =>x=7
\(4998\div7^2=302-2×\left(58×x-16\right)\)
\(102=302-2×\left(58×x-16\right)\)
\(2×\left(58×x-16\right)=302-102\)
\(2×\left(58×x-16\right)=200\)
\(58×x-16=200\div2=100\)
\(58×x=100+16=116\)
\(x=116\div58\)
\(x=2\)
Vậy...