31*82+125*48+31*43+125*67
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\(31.82+125.48+31.43-125.67\)
\(=31\left(82+43\right)-125\left(67-48\right)\)
\(=31.125-125.19\)
\(=125.12\)
\(=1500\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, \(12^8.9^{12}=\left(2^2.3\right)^8.9^{12}=2^{16}.3^8.9^{12}=2^{16}.9^4.9^{12}=2^{16}.9^{16}=18^{16}\)
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1, 69. (-74) - 31 . 74
= (-69) . 74 - 31 . 74
= 74(-69 - 31)
= 74(-100)
= -7400
2, (-2020) . 35 - 2020 . 65
= 2020 . (-35) - 2020 . 65
= 2020(-35 - 65)
= 2020(-100)
= -202000
3, -23 . 59 - 159 . 23
= 23 . (-59) - 159 . 23
= 23(-59 - 159)
= 23 . (-218)
= -5014
4, -147 . 47 + (-47)(-47) - 300
= -147 . 47 + 47 . 47 - 300
= 47(-147 + 47) - 300
= 47 . (-100) - 300
= -4700 - 300
= -5000
5, (-72) . 30 - 31 . (-30) + 3 + 30
= (-72) . 30 + 31 . 30 + 3 + 30
= 30(-72 + 31 + 1) + 3
= 30 . (-40) + 3
= -1200 + 3
= -1197
6, (-82)(-55) + (-82) + (-46)(-82)
= (-82)(-55 + 1 - 46)
= (-82)(-100)
= 8200
7, (-41) . 135 + 135 . (-24) - 35 . (-65)
= 135(-41 - 24) - 35(-65)
= 135(-65) - 35(-65)
= (-65)(135 - 35)
= -65(100)
= -6500
10, 125 . (-88)
= 1000 . \(\frac{1}{8}\) . (-88)
= 1000 . (-11)
= -11000
Câu 8 với 9 mình ko hiểu nên ko giúp bn được
Chúc bạn học tốt!
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b) [(24+-67)]-[-67-(-24)]=0
c) 2^3.17-2^3.14=112
d) 26.(-125)-125.(-36)=1250
e) 48-6(12+9)=-78
f) (-67).(1-301)-301.67=-67
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a ) 31 x ( - 125 ) + 225 x 31
= 31 x [ ( - 125 ) + 225 ]
= 31 x 100
= 3100
b ) 26 x ( - 125 ) - 125 x ( - 36 )
= ( - 26 ) x 125 - 125 x ( - 36 )
= 125 x [ ( - 26 ) - ( - 36 ) ]
= 125 x 10
= 1250
a) 31 × (-125) + 225 × 31
= 31 x ( -125 + 225 )
= 31 x 100
= 3100
b) 26 × (-125) – 125 × (-36)
= -125 ( 26 - 36 )
= 125x 10
= 1250
d) 17 × (-37) – 23 × 37 – 46 × (-37)
= -629 - 851 + 1702
= 1480
![](https://rs.olm.vn/images/avt/0.png?1311)
a) ( -125) + 100 + 80 + 125 + 20
= [ ( -125)+125] + ( 80+20) + 100
= 0 + 100 + 100 = 200
b) 27 + 55 + (-17) + ( - 55)
= [ 27+(-17)] +[ 55+(-55)]
= 10 + 0 = 10
c) (-92) + (-251) + (-8) + 251
= [ (-92) + (-8)] + [ (-251)+251]
= (-100) + 0 = -100.
d) (-31) + (-95) +131 + (-5)
= [ (-31)+131] +[ (-95)+(-5)] = 100 + (-100) = 0
e) (187 - 23) - (20-180)
= 187 - 23 - 20 + 180 = (187-180) - (23-20) = 7 - 3 = 4
g) (-50+19+143) - (-79+25+48)
= -50+19+143 + 79 - 25 - 48
= [ -50-25] + (19 + 79) + 143 - 48
= -75 + 98 + 143 - 48 = 143 - 75 + ( 98 -48)
= 68 + 50 = 118
\(31.82+125.48+31.43+125.67\)
\(=31.\left(82+43\right)+125.\left(48+67\right)\)
\(=31.125+125.115\)
\(=125.\left(31+115\right)\)
\(=125.146\)
\(=18250\)
Ủng hộ mk nha ^_^