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`@` `\text {Ans}`
`\downarrow`
`e)`
`1+(-4)+7+(-10)+13`
`= (-4 - 10) + (1 + 13) + 7`
`= -14+14 + 7`
`= 7`
`f)`
`-2+7+(-12)+17+(-22)`
`= (7 + 17) + (-12 - 22) - 2`
`= 24 - 34 - 2`
`= -10 - 2`
`= -12`
`g)`
`44+45+46+47-24-25-26-27`
`= (44 - 24) + (45 - 25) + (46 - 26) + (47 - 27)`
`= 20 + 20 + 20 + 20`
`= 20*4 = 80`
![](https://rs.olm.vn/images/avt/0.png?1311)
a)126.(-43)+26.43=43(-126+26)=43(-100)=-4300
b)(-135)(-45)-35.45=-45(-135+35)=-45(-100)=4500
c)113(-27)+27.13=27(-113+13)=27(-100)=-2700
d)125(-35)-(-25).35=-35(125-25)=-35.100=-3500
\(a)126.\left(-43\right)+26.43\)
\(=\left(-126\right).43+26.43\)
\(=43\left(-126+26\right)\)
\(=43.\left(-100\right)\)
\(=-4300\)
\(b)\left(-135\right).\left(-45\right)-35.45\)
\(=135.45-35.45\)
\(=45\left(135-35\right)\)
\(=45.100\)
\(=4500\)
\(c)113.\left(-27\right)+27.13\)
\(=\left(-113\right).27+27.13\)
\(=27\left(-113+13\right)\)
\(=27.\left(-100\right)\)
\(=-2700\)
\(d)125.\left(-35\right)-\left(-25\right).35\)
\(=\left(-125\right).35-\left(-25\right).35\)
\(=35\left(-125+25\right)\)
\(=35.\left(-100\right)\)
\(=-3500\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) x-29/6=13/6+10/12 b)15/26+x/13=46/25
x-29/6=3 x/13=46/25-15/26
x =3+29/6 x/13=821/650
x =47/6 x/650=821/650
x=821
c)2,8-x=6/5-3/5 d)24/x:8/3=0,6
2,8-x=2/5 24/x:8/3=3/5
14/5-x=2/5 24/x =3/5.8/3
x=14/5-2/5 24/x =8/5
x=12/5 24/x =24/15
x =15
a, x - 29/6 = 13/6 + 10/12
x - 29/6 = 26/12+10/12
x - 29/6 =3
x = 3 + 29/6
x = 47/6
vậy x = 47/6
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(A=125\left(-24\right)+24.225\)
\(=24\left[\left(-125\right)+225\right]\)
\(=24.100=2400\)
b) \(B=26\left(-125\right)-125\left(-36\right)\)
\(=125\left[\left(-26\right)-\left(-36\right)\right]\)
\(=125.10=1250\)
c) \(C=25\left(75-45\right)-75\left(45-25\right)\)
\(=25.75-25.45-75.45-75.25\)
\(=\left(25.75-75.25\right)-25.45-75.45\)
\(=-25.45-75.45\)
\(=45\left(-25-75\right)\)
\(=45\left(-100\right)=-4500\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 210 + [46 + (-210) + (-26)]
= 210 + [ (-164) + (-26) ]
= 210 + (-190)
= 20
b) (-8) - [(5) + 8 ]
=(-8) - 3
= -11
c) 25 . 134 + 25 . (-34)
= 25 . [ 134 + (-34) ]
= 25 . 100
= 2500
a, 210+[46+(-210)+(-26)
=210+46+(-210)+(-26)
=[210+(-210)]+[46+(-26)]
=0+20
=20
b,(-8)-[(-5)+8]
=(-8)-3
=-11
c,25.134+25.(-34)
=25.[134+(-34)]
=25.100
=2500
\(2^3\cdot2^2=2^{3+2}=2^5\)
=> CHọn B
Câu B