Tính nhanh : 25x(35-47)-35x(25-47)
-25x(35+147)+35x(25+147)
Giúp nha
=-25*35+(-25)*147+35*25+35*147
=-25*35+35*25+(-25)*147+35*147
=147*(-25+35)
=147*10
=1470
-25x[35+147]+35x[25+147]
= [-25+25]x[35+35]+[147+147]
=0x70+294
=0+294
=294
Bài 1 tính nhanh
A) 37 x 46 + 37 x 51 + 111
B) 35x 215 -35 x 210 - 175
c) 172 x 47 + 86 x 8 - 34 x4
d) 48 x 56 + 28 x104
a) \(37\times46+37\times51+111\)
\(=37\times46+37\times51+37\times3\)
\(=37\times\left(46+51+3\right)\)
\(=37\times100\)
\(=3700\)
b) \(35\times215-35\times210-175\)
\(=35\times215-35\times210-35\times5\)
\(=35\times\left(215-210-5\right)\)
\(=35\times0\)
\(=0\)
c) \(172\times47+86\times8-34\times4\)
\(=4\times\left(43\times47+86\times2-34\right)\)
\(=4\times\left(2021+172-34\right)\)
\(=4\times2159\)
\(=8636\)
d) \(48\times56+28\times104\)
\(=48\times56+56\times52\)
\(=56\times\left(48+52\right)\)
\(=56\times100\)
\(=5600\)
-25.(35+47)+35.(25+147)
giúp mk bài này cách nhanh nhất nha
Sửa lại đầu bài nha bạn :
-25 ( 35 + 47 ) + 35 ( 25 + 47 )
= - 25 x 35 + ( -25 ) x 47 + 35 x 25 + 35 x 47
= [ -25 x 35 + 35 x 25 ] + [ -25 x 47 + 35 x 47]
= 0 + [ ( -25 + 35 ) x 47 ]
= 0 + 10 x 47
= 470
-25. (35+47)+35.(25+147)
= (-25).35+(-25).47+35.25+35.147
= [(-25).35+35.25]+[(-25).47+35.147]
= 0 + [(-1175)+5145]
= 0 + 3970
= 3970
tính nhanh:
a) 85.(35-27) - 35.(85-27) =
b) 47.(45-15) - 47.(45+15) =
a)85.(35-27)-35.(85-27)
=85.35-27-35.85-27
=(85-85).(35-35).(27-27)
=0.0.0
=0
b)47.(45-15)-47.(45+15)
=47.45-15-47.45+15
=(47-47).(45-45).(15+15)
=0.0.30
=0
a) 85 . ( 35 - 27 ) - 35 . ( 85 - 27 )
= 85 . 35 - 85 . 27 - 35 . 85 + 35 . 27
= ( 85 . 35 - 35 . 85 ) - 27 . ( 85 - 35 )
= 0 - 27 . 50
= 0 - 1350
= -1350
b) 47 . ( 45 - 15 ) - 47 . ( 45 + 15 )
= 47 . ( 45 - 15 - 45 - 15 )
= 47 . (-30)
= -1410
Học tốt !!!
=))
Tính nhanh:
a ) 4 3 + 3 5 + 7 3 + 2 5 + 1 3 b ) 2 7 + − 3 8 + 4 7 + 1 7 + − 5 8 ; c ) − 5 9 + 8 15 + − 2 11 + 4 − 9 + 7 15 ; d ) 4 45 + − 1 15 + 7 45 + 4 15 + − 2 45 + − 1 5
Tính nhanh:
1) 69.(− 74)−31.74
2) (− 2020).35− 2020.65
3) − 23.59 −159.23
4) −147.47+ (− 47).(− 47)−300
5) (− 72).30 −31.−30 + 3.+ 30
6) (−82).(−55)+ (−82)+ (− 46).(−82)
7) (− 41).135+135.(− 24)−35.(−65)
8) 125.( 2) .( 25).9.( 10) .4 3 0 − − −
9) ( 2) .( 25).( 125).( 2) .2.( 50) 2 3 − − + − −
10) 125.(−88)
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!
Mọi người lại giúp em vs ạ!!!
Tính nhanh:
a) 85 x (35 - 27) - 35 x (85 - 27)
b) 47 x (45 -15) - 47 x (45+15)
c) (174 - 345) - (- 236 + 123 - 45)
d) - 25 x ( - 175 + 58) + 175 x (- 25 - 58)
ad ko biết nha
nhân hết ra là xong nha
a) 85x35-85x27-35x85+35x27=27x(35-85)=-1350
mấy cái kia cũng tương tự v
_Kudo_
=85.35-85.27-35.85+35.27
=85.35+85.(-27)-35.85+35.27
=85[35+(-27)+(-35)]+35.27
=85.(-27)+35.27
=-85.27+35.27
=27.[(-85)+35]
=27.(-50)
=-1350
-35/47-(25/13-35/47)+12/13
\(\frac{-35}{47}-\left(\frac{25}{13}-\frac{35}{47}\right)+\frac{12}{13}\)
\(=\frac{-35}{47}-\frac{25}{13}+\frac{35}{47}+\frac{12}{13}\)
\(=\left(\frac{-35}{47}+\frac{35}{47}\right)+\left(\frac{-25}{13}+\frac{12}{13}\right)\)
\(=0-1\)
\(=-1\)
_Chúc bạn học tốt_
\(\frac{-35}{47}-\left(\frac{25}{13}-\frac{35}{47}\right)+\frac{12}{13}\)
=\(\frac{-35}{47}-\frac{720}{611}+\frac{12}{13}\)
=\(-1\)
\(-\frac{35}{47}-\left(\frac{25}{13}-\frac{35}{47}\right)+\frac{12}{13}\)............ k cho mik nhé! ...............
\(=\)\(-\frac{35}{47}-\frac{25}{13}+\frac{35}{47}+\frac{12}{13}\)
\(=-\frac{35}{47}+\frac{35}{47}-\frac{25}{13}+\frac{12}{13}\)
\(=-\frac{25}{13}+\frac{12}{13}\)\(=-\frac{13}{13}=-1\)
tính nhanh : 35^2 + 47^2 - 18^2 + 70 x 47
làm kiểu gì vậy m.n
352 + 472 - 182 + 70 x 47
= (352 + 472 + 2 x 35 x 47) - 182
= (35 + 47)2 - 182
= 822 - 182 = (82 - 18)(82 + 18) = 64 x 100 = 6400