a. 1339:x=13 b.1428:x=14
c. 2436:x=12
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b) 231−(x−6)=1339:13231−(x−6)=1339:13\
231−(x−6)=103231−(x−6)=103
x−6=231−103=128x−6=231−103=128
x=128+6=134
b, \left(32.15\right):2=\left(x+70\right):14-40(32.15):2=(x+70):14−40
\Rightarrow\left(x+70\right):14-40=480:2⇒(x+70):14−40=480:2
\Rightarrow\left(x+70\right):14=240+40=280⇒(x+70):14=240+40=280
\Rightarrow x+70=3920\Rightarrow x=3850⇒x+70=3920⇒x=3850
c, x-4867=\left(175.2050.70\right):25+23x−4867=(175.2050.70):25+23
\Rightarrow x=39462500:25+23+4867⇒x=39462500:25+23+4867
\Rightarrow x=1578500+23+4867=1583390⇒x=1578500+23+4867=1583390
c=20
a)x:13=41 c)1428:x=14
x=41x13=533 x=1428:14=102
d)8(x-3)=0
Suy ra: x-3=0 x=0+3=3
a, x : 13 = 41
x = 41 x 13
x = 533
b, 1428 : x = 14
x = 1428 : 14
x = 102
c, 8(x - 3) = 0
x - 3 = 0 x 8
x - 3 = 0
x = 0 + 3
x = 3
\(230-\left(x-12\right)=1339:13\)
\(230-\left(x-12\right)=103\)
\(x-12\text{ }=230-103\)
\(x-12\text{ }=127\)
\(x\) \(=127+12\)
\(x\) \(=139\)
230 - (x - 12) = 1339 : 13 = 103
230 - x + 12 = 13
230 - x = 91
x = 230 - 91 = 139
a, x : 13 = 41
x = 41 x 13
x = 533
Vậy x = 533
b, 1428 : x = 14
x = 1428 : 14
x = 102
Vậy x = 102
c, 4x : 17 = 0
4x = 0 x 17
4x = 0
x = 4 : 0
x =0
Vậy x = 0
= 12/11
a)13-2(x+1)=7
2.(x+1)=13-7
2.(x+1)=6
x+1=6/2
x+1=3
x=3-1
x=2
a, 13 - 2 ( x + 1 ) = 7
2 .( x + 1 ) = 13 - 7
2 .( x + 1 ) = 6
x + 1 = 6 : 2
x + 1 = 3
x = 3 - 1
x = 4
a, \(1339:x=13\Leftrightarrow x=\dfrac{1339}{13}=103\)
b, \(1428:x=14\Leftrightarrow x=\dfrac{1428}{14}=102\)
c, \(2436:x=12\Leftrightarrow x=\dfrac{2436}{12}=203\)
a) 1339 : x = 13
x = 1339 : 13
x = 103
b) 1428 : x = 14
x = 1428 : 14
x = 102
c) 2436 : x = 12
x = 2436 : 12
x = 203