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\(\left(30-x\right).4=92\)
\(30-x=92:4\)
\(30-x=23\)
\(x=30-23\)
\(x=7\)
\(\left(30-x\right).4=92\)
\(30-x=92:4\)
\(30-x=23\)
\(x=30-23\)
\(x=7\)
a) 39 . (x - 5 ) = 0
x - 5 = 0 : 39
x - 5 = 0
x = 0 + 5
x = 5
b) ( 30 - x ) . 4 = 92
30 . x = 92 : 4
30 . x = 23
x = 23 : 30
x =\(\frac{23}{30}\)
\(\left(d\right)30-x=200-175\)
\(30-x=25\)
\(x=5\)
\(\left(e\right)5\left(x+12\right)=70\)
\(x+12=14\)
\(x=2\)
tương tự 2 câu trên bạn tự làm câu cuối nhé, mình không ghi lại đề đâu
#quankun^^
a) \(70-5\left(x-3\right)=45\)
\(5\left(x-3\right)=25\)
\(x-3=5\)
\(\Rightarrow x=8\)
b) \(12+\left(5+x\right)=20\)
\(5+x=8\)
\(\Rightarrow x=3\)
c) \(130-\left(100+x\right)=25\)
\(100+x=105\)
\(\Rightarrow x=5\)
d) \(175+\left(30-x\right)=200\)
\(30-x=25\)
\(\Rightarrow x=5\)
e) \(5\left(x+12\right)+22=92\)
\(5\left(x+12\right)=70\)
\(x+12=14\)
\(\Rightarrow x=2\)
a. 70 - 5.(x - 3) = 45
5.(x - 3) = 70 - 45
x - 3 = 25 : 5
x = 5 + 3
x = 8
b. 12 + (5 + x) = 20
5 + x = 20 - 12
x = 8 - 5
x = 3
c. 130 - (100 + x) = 25
100 + x = 130 - 25
x = 105 - 100
x = 5
d. 175 + (30 - x) = 200
30 - x = 200 - 175
x = 30 - 25
x = 5
e. 5.(x + 12) + 22 = 92
5.(x + 12) = 92 - 22
x + 12 = 70 : 5
x = 14 - 12
x = 2
\(92.4-27=\frac{x+350}{x}+135\)
=>\(368-27=\frac{x}{x}+\frac{350}{x}+315\)
=>\(341=1+\frac{350}{x}+315\)
=>\(341=\frac{350}{x}+316\)
=>\(341-316=\frac{350}{x}\)
=>\(\frac{350}{x}=25\)
=>x=350:25
=>x=14
368-27=(x+350):x+315
341=(x+350):x+315
x:x+350:x=341-315
1+350:x=26
350:x=26-1
350:x=25
x=350:25
x=14
hk tốt
92 . 4 - 27 = (x+ 350 ) : x + 315
<=> 365 - 27 = (x + 350):x +315
<=> 341 = (x+350 : x +315
<=> (x + 350 ): x = 341 - 315
<=> (x + 350 ) : x = 26
<=>(x + 350 ) . 1/x=26
<=> x . 1/x + 350 . 1/x = 26
<=> 1 + 350/x =26
<=> 350/x = 26-1
<=> 350 : x = 25
<=> x = 350 : 25
<=> x = 14
vậy x = 14
a) \(\left|x\right|+2=2^3.\left(-2\right)^2\)
\(\Leftrightarrow\)\(\left|x\right|+2=32\)
\(\Leftrightarrow\)\(\left|x\right|=30\)
\(\Leftrightarrow\)\(x=\pm30\)
Vậy...
b) \(\left|x\right|+4=\left(-3\right)^2+\left(-2\right)\)
\(\Leftrightarrow\)\(\left|x\right|+4=7\)
\(\Leftrightarrow\)\(\left|x\right|=3\)
\(\Leftrightarrow\)\(x=\pm10\)
Vậy...
b2 :
a) 5 . ( -5 - 6 )
= 5 . ( -11 )
= -55
b) 321 + { - 15 + [ 30 + ( -321 ) ] }
= 321 + { - 15 + [ - 291 ] }
= 321 + ( - 306 )
= 15
19 . 92 - 9 . ( - 19 ) - 19
= 1748 - ( -171 ) - 19
= 1919 - 19
= 1900
[ 30 - x ] : 4 = 92
30 - x = 92 x 4
30 - x = 368
x = 30 - 368
x = -338
<=> 30 - x = 92 . 4 = 369
<=> x = 30 - 368 = -338