1, tìm x , biết
a, x + 16 =20
b, x +96 = 180
ai nhanh mk tick
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
( 158 x 129 - 158 x 39 ) : 180
= [ 158 x ( 129 - 39 ) ] : 180
= [ 158 x 90 ] : 180
= 14220 : 180
= 79
1) ( 158 x 129 - 158 x 39 ) : 180
= [158 x (129 - 39 ) ] : 180
= 158 x 90 : 180
= 158 x ( 90 : 180 )
= 158 x 1/2
= 158 : 2
= 79.
2)102- 96 +90-84+78-72+66-60+54-48
= ( 102 - 72 ) + ( -96 + 66 ) + ( 90 - 60 ) + ( -84 + 54 ) + ( 78 - 48 )
= 30 - 30 + 30 - 30 + 30 = 30
x=2;-4
x=5
tk cho mk nhe
mk nhanh nhat
kb với mk rối mk tk lại cho
x=3;-4
x=5
tk cho mk nhe
mk nhanh nhat
kb voi mk roi mk tk lai cho
`[ ( 2 xx x - 11 ) : 3 + 1 ] xx 5 = 20`
`( 2 xx x - 11 ) : 3 + 1=20:5`
`( 2 xx x - 11 ) : 3 + 1=4`
`( 2 xx x - 11 ) : 3 =4-1`
`( 2 xx x - 11 ) : 3 =3`
`2xx x -11=3xx3`
`2xx x -11=9`
`2xx x =9+11`
`2 xx x=20`
`x=20:2`
`x=10`
Vậy `x=10`
`b, x - 96 = ( 443 - x ) - 15`
`x-96=443-x-15`
` x+x=443-15+96`
`2x=524`
`x=524:2`
`x= 262`
Vậy `x=262`
\(#Nqoc\)
`a)`
\([ ( 2 \times x - 11 ) \div 3 + 1 ] \times 5 = 20\)
`(2 \times x - 11) \div 3 + 1 = 20 \div 5`
`(2 \times x - 11) \div 3 + 1 = 4`
`(2 \times x - 11) \div 3 = 4 - 1`
`(2 \times x - 11) \div 3 = 3`
`2 \times x - 11 = 3 \times 3`
`2 \times x - 11 = 9`
`2 \times x = 9 + 11`
`2 \times x = 20`
`x = 20 \div 2`
`x = 10`
Vậy, `x = 10`
`b)`
\(x - 96 = ( 443 - x ) - 15\)
`x - 96 = 443 - x - 15`
`x - 96 = 428 - x`
`x = 428 - x + 96`
`x = 524 - x`
`x - 524 + x = 0`
`(x + x) - 524 = 0`
`2x - 524 = 0`
`2x = 524`
`x = 524 \div 2`
`x = 262`
Vậy, `x = 262.`
a) -x - 84=-16-213
-x-84=-229
-84+229=x
145 =x
b) /x+2/= 316
suy ra x+2=316 hoac x+2=-316
* x+2 = 316
x = 314
* x+2 =-316
x = -318
vay x=314 hoac x=-318
c) /x+7/=15
suy ra x+7=15 hoac x+7=-15
x+7=15
x = 8
x+7= -15
x = -22
vay x= 8 hoac x=-22
d) 19-4=/x-1/
15=/x-1/
suy ra x-1=15 hoac x-1=-15
x-1=15
x = 16
x-1=-15
x= -14
vay x=16 hoac x=-14
\(-\left(x+84\right)+213=-16\)
\(=>-x-84+213=-16\)
\(=>-x=-16+84-213=-145\)
\(=>x=145\)
\(\left|x+2\right|=341+\left(-25\right)\)
\(=>\left|x+2\right|=341-25=316\)
\(=>\orbr{\begin{cases}x+2=316\\x+2=-316\end{cases}}\)
\(=>\orbr{\begin{cases}x=314\\x=-318\end{cases}}\)
a)
\(\frac{864\cdot48-432\cdot96}{864\cdot48\cdot432}=\frac{432\cdot2\cdot48-432\cdot96}{864\cdot48\cdot432}=\frac{432\cdot96-432\cdot96}{864\cdot48\cdot432}=\frac{0}{864\cdot48\cdot432}=0\)
Làm từng phần một nha =))
b)
\(\frac{16\cdot17-5}{16\cdot16+11}=\frac{16\cdot\left(16+1\right)-5}{16\cdot16+11}=\frac{16^2+16-5}{16^2+11}=\frac{16^2+11}{16^2+11}=1\)
@_@
a) \(\left|x-1\right|=0\)
<=>\(x-1=0\)<=> \(x=1\)
vậy \(x=1\)
b) \(-13.\left|x\right|=-26\)
<=> \(\left|x\right|=2\)=> \(x=\pm2\)
vậy \(x=\pm2\)
c) \(-16+23+x=-16\)
<=> \(7+x=-16\)
<=>\(x=-23\)
vậy \(x=-23\)
42-2(x+16) +12 :2=6(x-1)+ (-4)^3 :16
42- 2x- 32 +6 = 6x - 6 - 64: 16
(42 - 32 +6) - 2x = 6x - 6 - 4
16 = 2x = 6x- 10
16+10= 2x+6x
26= 8x
x= 26/8
x= 13/4
a.
\(x^2=16\)
\(x^2=\left(\pm4\right)^2\)
\(x=\pm4\)
Vậy x = 4 hoặc x = -4
b.
x3 = -8
x3 = (-2)3
x = -2
\(a>x^2=16\)
\(x^2=4^2=\left(-4\right)^2\)
\(\Rightarrow x=\pm4\)
\(b>x^3=-8\)
\(x^3=\left(-2\right)^3\)
\(\Rightarrow x=-2\)
\(\left(2x-3\right)^2=16\)
\(\Rightarrow\left(2x-3\right)^2=4^2\)
\(\Rightarrow2x-3=4\)
\(2x=4+3=7\)
\(x=7:2=\frac{7}{2}\)
k mk nha.
#ngố
Mk nghĩ z thui.Sai thui nha!
(2x-3)2=16
=>(2x-3)2=42
=>2x-3=4
=>2x=4+3
=>2x=7
=>x=7:2
=>x=7/2
K mk nha!
a ) x + 16 = 20
x = 20 - 16
x = 4
b ) x + 96 = 180
x = 180 - 96
x = 84
a) x+16=20
x= 20-16
x=4
b)x+96=180
x=180-96
x=84