15+x+27+53=201
50*x+20617=80617
X*25+x*35=90*360
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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`
x-27+15=53
x-27=53-15
x-27=38
x=38+27
x=65
x-35=43-14
x-35=29
x=29+35
x=64
x-27+15=53
<=> x-27=53-15
<=>x-27=38
<=>x=38+27
<=>65
x-35=43-14
<=>x-35=29
<=>x=29+35
<=>x=64
Bài 3:
a: Ta có: \(23\left(42-x\right)=23\)
\(\Leftrightarrow42-x=1\)
hay x=41
b: Ta có: 15(x-3)=30
nên x-3=2
hay x=5
Bài 1:
a: 32+89+68=100+89=189
b: 64+112+236=300+112=412
c: \(1350+360+650+40=2000+400=2400\)
A/ 15+(3-x)=-10
15+3-x=-10
18-x=-10
-x=-10-18=-8
Suy ra x= 8
a, 15 + (3-x) = -10
3-x = -10 - 15
3-x = -25
x = 3 - (-25)
x = -28
b, 11 - ( 53 + x ) = 97
53 + x = 11 - 97
53 + x = -86
x = -86 - 53
x = -139
c, 5x - (-25) = 35
5x =35 + ( -25)
5x = 10
x = 10 : 5
x = 2
a/ ( 35-x)-25=40-(15-18)
(35-x)-25=40-(-3)
(35-x)-25=43
35-x=43+25
35-x=68
x=35-68
x= -33
b/ x+42=-15+27: 3^2
x+42=-15+27 : 9
x+42=-15+3
x+42=-12
x=-12 -42
x= -54
a) 15 + x + 27 + 53 = 201
=> x + ( 15 + 27 + 53 ) = 201
=> x + 95 = 201
=> x = 201 - 95
=> x = 106
Vậy x = 106
b) 50 * x + 20 617 = 80 617
=> 50 * x = 80 617 - 20 617
=> 50 * x = 60 000
=> x = 60 000 : 50
=> x = 1 200
Vậy x = 1 200
c) x * 25 + x * 35 = 90 * 360
=> x * ( 25 + 35 ) = 32 400
=> x * 60 = 32 400
=> x = 32 400 : 60
=> x = 540
Vậy x = 540