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=1992 - 53 + 158 - 247 - 1592
=( 1992 - 1592 ) - [ 53 + 247 ] + 158
= 400 - 300 + 158
=100 + 158 = 258
1992 + ( - 53 ) + 158 + ( - 247 ) + ( - 1592 )
= 1992 + ( - 1592 ) + ( - 53 ) + ( - 247 ) + 158
= 400 + ( - 300 ) + 158
= 100 + 158
= 258
27 x (-53 ) + ( -27) x 47
= 27 x ( -53 + -47 )
= 27 x ( - 100 ) = -2700
b: Ta có: \(1992+\left(-53\right)+158+\left(-247\right)+\left(-1592\right)\)
\(=\left(1992-1592\right)+\left(-53-247\right)+158\)
\(=400-300+158=258\)
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`
( 764 - 759 ) + ( 368 - 369 )
= 5 - 5 = 10
b) ( 4172 - 4168 ) - (1873 - 1869 )
= 4-4 = 0
a) 27 x 35 + 73 x 6 - 27 x 29
= 27 x ( 35 - 29 ) + 73 x 6
= 27 x 6 + 73 x 6
= 6 x ( 27 + 73 )
= 6 x 100
= 600
b) 29 x ( 47 + 53 ) - 47 x ( 29 + 53 )
= 29 x 47 + 29 x 53 - 47 x 29 + 47 x 53
= 29 x ( 47 + 53 - 47 ) + 47 x 53
= 29 x 53 + 47 x 53
= 53 x ( 29 + 47 )
= 53 x 76
= 4028
c) 5 x 17 x 4 x 25 x 20
= ( 5 x 20 ) x ( 4 x 25 ) x 17
= 100 x 100 x 17
= 10000 x 17
= 170000
73.52+52.28-52
=52.(73+28-1)
=52.100
=25.100
=2500
5x+53=1010
5x+125=1010
5x=1010-125
5x=885
x=885:5
x=177
2727:(158-x)=27
158-x=2727:27
158-x=101
x=158-101
x=57
5x + 125 = 1010
5x = 1010 - 125
5x = 885
x = 885 : 5
x = 177