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a: =50-52=-2
b: =-35+149-114
=-149+149
=0
c: =-29x100=-2900
![](https://rs.olm.vn/images/avt/0.png?1311)
(-12) + (-18)
= -30
------------------
(-90) + 27 + (-10) + 73
= [(-90) + (-10) + (27 + 73)
= -100 + 100
= 0
---------------------------------
25 . (-5) . (-4)
= 25 . (-4) . (-5)
= -100 . (-5)
= 100 . 5
= 500
----------------------------------------
(-15) . 40 : 6
= [(-15) . 40] : 6
= (-600) : 6
= -100
-----------------------------------
(-27) . 58 + (-27) . 42
= (-27) . (58 + 42)
= (-27) . 100
= -2700
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( 43 − 13 ) . ( − 3 ) + 27. ( − 14 − 16 ) = 30. ( − 3 ) + 27. ( − 30 ) = ( − 30 ) .3 + 27. ( − 30 ) = ( − 30 ) . ( 3 + 27 ) = ( − 30 ) .30 = − 90
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Bài 3 :
A = 26 + 27 + 28 + 29 + 30 + 31 + 32 + 33
=> A = ( 33 + 26 ) . 8 : 2 = 236
Vậy A = 236
\(\text{#Hok tốt!}\)
a) 2 . 31 . 12 + 4 . 6 . 42 + 8 . 27 . 3
= 24 . 31 + 24 . 42 + 24 . 27
= 24 . ( 31 + 42 + 27 )
= 24 . 100
= 2400
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85(35-27)-35(85-27)=85.35-85.27-35.85+35.27
=(85.35-35.85)+(35.27-85.27)
=0+27.(35-85)
=27.(-40)
=-1080
85(35-27)-35(85-27)
= 85.35-85.27-35.85-35.27
=(85.35-35.85)+(35.27-85.27)
=0+27.(35-85)
=27.(-40)
= 1080
![](https://rs.olm.vn/images/avt/0.png?1311)
Trả lời :
\(a,\frac{3}{2}\times\left(\frac{5}{7}-\frac{4}{3}\right)-\frac{4}{3}\times\left(\frac{5}{7}-\frac{3}{2}\right)\)
\(=\frac{3}{2}\times\frac{5}{7}-\frac{3}{2}\times\frac{4}{3}-\frac{4}{3}\times\frac{5}{7}+\frac{4}{3}\times\frac{3}{2}\)
\(=\frac{3}{2}\times\frac{5}{7}-\frac{4}{3}\times\frac{5}{7}\)
\(=\frac{5}{7}\times\left(\frac{3}{2}-\frac{4}{3}\right)\)
\(=\frac{5}{42}\)
b, Tương tự câu a. Kết quả \(=-\frac{3}{7}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 135 . (-27) + 27 . 235
= 27 . (235 - 135)
= 27 . 100
= 2700
b) 36 . (-125) - 125 . (-46)
= 125 . (-36 + 46)
= 125 . 10
= 1250
c) 32 . (-64) - 64 . 68
= 64.(-32 - 68)
= 64.(-100)
= -6400
d) (145 - 45) . (-31) + 31 . (-100)
= 100 . (-31) + 31.(-100)
= 100.(-31 - 31)
= 100.(-62)
= -6200
a)
=(-135)x27+27x235
=27x[+(235+135)]
=27x31725
=856575
b)
=(-36)x125-125x(-46)
=125x[-(36+46)]
=125x(-1656)
=-207000
c)
=(-32)x64-64x68
=64x[-(68-32)]
=64x(-36)
=-(64x36)
=-2304
d)
=100x(-31)+31x(-100)
=(-100)x31+31x(-100)
=31x[-(100+100)]
=31x(-200)
=-(31x200)
=-6200
chúc học tốt nhớ tích cho tui nha
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a.\left(47\times27\right)\times\left(-13\right)+13\left(-53-27\right)\)
\(=1269\times\left(-1\right)\times13+13\left(-80\right)\)
\(=13\left(-1269\right)+13\left(-80\right)\)
\(=13\left[\left(-1269\right)+\left(-80\right)\right]\)
\(=13\left(-1349\right)\)
\(=-17537\)
\(b.-17\left(13+5\right)-13\left(-17-2\right)\)
\(=13\left(-17\right)+5\left(-17\right)-13\left(-17\right)+13.2\)
\(=0-85+26\)
\(=-59\)
`27 . 64 + 27 .33 + 3 . 27`
`=27 . (64 + 33 + 3)`
`=27. 100`
`=2700`
\(27.64+27.33+3.27\)
\(=27.\left(64+33+3\right)\)
\(=27.100\)
\(=2700\)