x+27-(-15)=49
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`16/27xx13/29+16/27xx14/29`
`=16/27xx(13/29+14/29)`
`=16/27xx27/29`
`=16/29`
`48/49+15/39-18/49+15/39`
`=(48/49-18/49)+(15/39+15/39)`
`=30/49+30/39`
`=880/637`
a) `123 - 27 + 27 + 13 - 123`
`= (123 - 123) + (27 - 27) + 13`
`= 0 + 0 + 13`
`= 13`
`---`
b) `175 + 25 + 13 + 15 - 175 - 25`
`= (175-175)+(25-25)+25+13`
`=0+0+25+13`
`=28`
`---`
c) \(53\times39+47\times39+53\times21+47\times21\)
\(=\text{[}\left(53+47\right)\times39]+\left[\left(53+47\right)\times21\right]\)
\(=\left(100\times39\right)+\left(100\times21\right)\)
\(=3900+2100\)
`=6000`
`---`
d) \(49\times35+49\times16-49\times61\)
`=` \(49\times\left(35+16-61\right)\)
`=` \(49\times\left(-10\right)\)
`=-490`
a) 15-(49-4x)=3x-27
<=> 15-49+4x=3x-27
<=> -34+4x-3x=-27
<=> x=-27+34=7
Vậy x=7
b) 70-(x-37)-(-61)=14-2x
<=> 70-x+34+61=14-2x
<=> 120-x+2x=14
<=> x=120-14=106
Vậy x=106
49 - |-17 - (-15) - x| = -3 + 27
49 - |-2 - x| = 24
|-2 - x| = 25
TH1: -2 - x = 25
x = -27
TH2: -2 - x = -25
x = 23
49-|-17-(-15)-x|=-3+27
49-|-17-(-15)-x|=24
|-17-(-15)-x|=49-25
|-2-x|=24
=>|-2-x|=+24
TH1:
-2-x=24
x=-2-24
x=-27
TH2:
-2-x=-24
x=-2-(-24)
x=23
49 - |-17 - (-15) - x| = -3 + 27
=> |-17 + 15 - x| = 49 - (-3 + 27)
=> |-2 - x| = 49 - 24
=> |-2 - x| = 25
+) -2 - x = 25 => x = -2 - 25 = -27
+) -2 - x = -25 => x = -2 - (-25) = -2 + 25 = 23
Vậy x thuộc {-27; 23}.
49 - | -17 - ( -15 ) - x|= -3 + 27
49 - | -17 - ( -15 ) - x|= 24
| -17 - ( -15 ) - x|= 49 - 24
| -17 - ( -15 ) - x|= 25
=>-17 - ( -15 ) - x=25 hoặc -17 - ( -15 ) - x = -25
( -15 ) - x=-17-25 ( -15 ) - x=(-17)-(-25)
( -15 ) - x=-42 ( -15 ) - x=8
x=(-15)-(-42) x=(-15)-8
x=27 x=-23
x={-23;27}
=>x+27+15=49
=>x+42=49
=>x=7
X + 27 - ( -15 ) = 49
X + 27 = 49 + ( -15 )
X + 27 = 34
X = 34-27
X = 7