43*17+29*57+13*43+57
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e, (-25).(-13).8.(-4).125
= (-25).(-4).8.125.(-13)
= 100.1000.(-13)=-1300000
f, 38.(-43)+43.(-79)-(-43).17
= 38.(-43)+(-43).79-(-43).17
= (-43).(38+79-17)
= (-43).100=-4300
a) ( -7) . 11 + 7 . ( - 89 )
= 7 . (-11) + 7 . (-89)
= 7 . [(-11)+(-89)]
= 7 . (-100)
= -700
![](https://rs.olm.vn/images/avt/0.png?1311)
a,x+(-45)=(-62)+17
<=>x=(-62)+17+45
<=>x=0
b,x+29=\(|-43|\)-+(-43)
<=>x=43-43-29
<=>x=-29
c,43+(9-21)=317-(x+317)
<=>31=317-x-317
<=>31=-x
<=>-31=x
d, (15-x)+(x-12)=7-(-5-x)
<=>15-x+x-12=7+5+x
<=>3=12+x
<=>-9=x
e, x-{57-[42+(-23-x)]}=13-{47+[25-(32-x)]}
<=>x-57+42-23-x=13-47-25+32-x
<=>76=-27-x
<=>103=-x
<=>-103=x
f,\(|x|+|-4|=7\)
<=>\(|x|\)+4=7
<=>\(|x|\)=3
<=>x=3 hoặc x=-3
![](https://rs.olm.vn/images/avt/0.png?1311)
a,24.57+43.24
=24.(57+43)
=24.100
=2400
b,12.19+12
=12.(19+1)
=12.20
=12.10.2
=120.2
=240
c,43.27+93.43+57.61+59.57
=43.(27+93)+57.(61+59)
=43.120+57.120
=120.(43+57)
=120.100
=12000
d,64.6+81.4+17.6
=64.6+27.3.2.2+17.6
=64.6+54.6+17.6
=(64+54+17).6
=135.6
=810
a) 24 . 57 + 43 . 24
= 24 . (57 + 43)
= 24 . 100
= 2400
b) 12 . 19 + 12
= 12 . (19 + 1)
= 12 . 20
=240
c) 43 . 27 + 93 . 43 + 57 . 61 +59 . 57
= 43 . ( 27 + 93) + 57 . (61 + 59)
= 43 . 120 + 57 . 120
= 120 . (43 + 57)
= 120 . 100
= 12000
![](https://rs.olm.vn/images/avt/0.png?1311)
`@` `\text {Ans}`
`\downarrow`
`471 + 43 + 29 + 57`
`= (471 + 29) + (43+57)`
`= 500 + 100`
`= 600`
471+43+29+57
= (471+29)+(43+57)
=500+100
=600
Chúc bn hok tốt!!!
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,\left(13+150+47\right)-\left(13+47\right)\)
\(=13+150+47-13-47\)
\(=\left[13+\left(-13\right)\right]+\left[47+\left(-47\right)\right]+150\)
\(=0+0+150\)
\(=150\)
\(b,\left(-237\right)-\left[\left(-237+155\right)-55\right]\)
\(=\left(-237\right)+237+155-55\)
\(=0+100\)
\(=100\)
\(c,57.\left(62-43\right)-62.\left(57-43\right)\)
\(=57.62-57.43-62.57+62.43\)
\(=-57.43+62.43\)
\(=43.\left(-57+62\right)\)
\(=43.5\)
\(=215\)
a , ( 13 + 150 + 47 ) - ( 13 + 47 )
= 12 + 150 + 47 - 13 - 47
= [ 12 + ( - 13 ) ] + [ 47 + ( - 47 ) ] + 150
= - 1 + 0 + 150
= 149
b , ( - 237 ) - [ ( - 237 + 155 ) - 55 ]
= - 237 - [ - 237 + 155 - 55 ]
= - 237 + 237 - 155 + 55
= [ ( - 237 ) + 237 ] + [ ( - 155 ) + 55 ]
= 0 + ( - 100 )
= - 100
c , 57 . ( 62 - 43 ) - 62 . ( 57 - 43 )
= 57 . 62 - 57 . 43 - 62 . 57 - 62 . 43
= [ 57 . 62 - 62 . 57 ] . [ 62 . 43 - 62 . 43 ]
= 0 . 0
= 0
3000
43 . 17 + 29 . 57 + 13 . 43 + 57
= 43 . ( 17 + 13 ) + 57 . ( 29 + 1 )
= 43 . 30 + 57 . 30
= 30 . ( 43 + 57 )
= 30 . 100
= 3 000