25×31+25×69-500
c) 25. 69 + 31. 25 – 150;
25. 69 + 31. 25 – 150
=(69+31) . 25 -150
=100 . 25 - 150
=2500 - 150
=2350
0.25 nhan 25 +19,96 nhan 31+0.15 nhan 25+19,96 nhan 69
0,25 x 25 + 19,96 x 31 + 0,15 x 25 + 19,96 x 69
= 25 x ( 0,25 + 0,15 ) + 19,96 x ( 31 + 69 )
= 25 x 0,4 + 19,96 x 100
= 10 + 1 996
= 2 006
Tính :
1) ( -35 ). 18 + 28. 35
2) 53. 29 - 47. ( -29 )
3) 125. ( -24 ) + 24. 225
4) 26. ( -121 ) - 121. ( -36 )
5) 65. ( -25 ) + 25. ( -23 )
6) 237. ( -26 ) + 26. 137
7) 30. ( -125 ) + 25. 30
8) ( -37 ). 69 + ( -31 ). 37
9) 31. 72 - 31. 70 - 31.2
10) ( -12 ). 47 + ( -12 ) . 52 + ( -12 )
1) $(-35)\cdot18+28\cdot35$
$=35\cdot(-18)+28\cdot35$
$=35\cdot(-18+28)$
$=35\cdot10$
$=350$
2) $53\cdot29-47\cdot(-29)$
$=53\cdot29-47\cdot(-1)\cdot29$
$=53\cdot29+47\cdot29$
$=29\cdot(53+47)$
$=29\cdot100$
$=2900$
3) $125\cdot(-24)+24\cdot225$
$=(-125)\cdot24+24\cdot225$
$=24\cdot(-125+225)$
$=24\cdot100$
$=2400$
4) $26\cdot(-121)-121\cdot(-36)$
$=-121\cdot[26+(-36)]$
$=-121\cdot(26-36)$
$=-121\cdot(-10)$
$=121\cdot10$
$=1210$
5) $65\cdot(-25)+25\cdot(-23)$
$=-65\cdot25+25\cdot(-23)$
$=25\cdot(-65-23)$
$=25\cdot(-88)$
$=-2200$
6) $237\cdot(-26)+26\cdot137$
$=-237\cdot26+26\cdot137$
$=26\cdot(-237+137)$
$=26\cdot(-100)$
$=-2600$
7) $30\cdot(-125)+25\cdot30$
$=30\cdot(-125+25)$
$=30\cdot(-100)$
$=-3000$
8) $(-37)\cdot69+(-31)\cdot37$
$=37\cdot(-69)+37\cdot(-31)$
$=37\cdot(-69-31)$
$=37\cdot(-100)$
$=-3700$
9) $31\cdot72-31\cdot70-31\cdot2$
$=31\cdot(72-70-2)$
$=31\cdot(2-2)$
$=31\cdot0$
$=0$
10) $(-12)\cdot47+(-12)\cdot52+(-12)$
$=-12\cdot(47+52+1)$
$=-12\cdot100$
$=-1200$
$\text{#}Toru$
Bài 1: Thực hiện phép tính:
a) 25. 69 + 31. 25 – 150; b) 198 : [130 – (27 – 19 )2] + 20210 ;
c) 520 : (515.15 + 515.10).
a) 25.69+31.25-25.6
= 25.(69+31-6)
= 25.94
= 2350
b) 198:[130-(27-19)2]+20210
= 198:[130-82]+1
= 198:(130-64)+1
= 198:66+1
= 3+1
= 4
c) 520:[515.(15+10)]
= 520:[515.25]
= 520:(515.52)
= 520: 517
= 53
a) - 23+150(-9)+1913
b) 2 MŨ2 .5 + ( 49 – 17 MŨ 2 )
c) 25. 69 + 31. 25 – 150; d) 198 : [130 – (27 – 19 ) MŨ 2] + 2021 MŨ 0
a) 25. 69 + 31. 25 – 150;
b) 198 : [130 – (27 – 19 )2] + 20210 ;
c) 520 : (515.15 + 515.10).
d) 27– (15 – 31) – (– 2 + 21+ 5)
e) 47 – (23 + 17) – (– 17 + 47)
f) 34 – [(–12) + 34] – (49 + 12) g) 72 – (15 – 14 + 72) + 52
a: =25x100-150=2500-150=2350
c: \(=520:\left\{515\cdot25\right\}\)
=104/2575
Tính bằng cách thuận tiện (theo mẫu):
75+25+46=(75+25)+46
=100+46
=146
a) 36 + 14 + 9
b) 51 + 12 + 18
c) 65 + 9 + 5
d) 31 + 26 + 69
`a, 36 + 14 + 9`
`= 50 + 9`
`= 59`
`b, 51 + 12 + 18`
`=51 + 30`
`= 81`
`c, 65 + 9 + 5`
`= 70 + 9`
`= 79`
`d, 31 + 26 + 69`
`= 100 + 26`
`= 126`
2 . 53 . 27 + 6 . 9 . 87 - 3 . 18 . 40 = ???
12 . 25 + 29 . 25 + 59 . 25 = ???
43 . 37 + 93 . 43 + 57 . 61 + 69 . 57 = ???
12 . 53 + 53 . 172 - 53 = ???
35 . 54 + 35 . 58 + 65 . 75 + 65 . 45 = ???
39 . 8 + 70 . 3 + 31 . 8 = ???
2 . 53 . 27 + 6 . 9 . 87 - 3 . 18 . 40
= 2. 53 . 9 . 3 + 2. 3 .9 .87 - 3 .2 .9 .40
= 54.53+54.87-54.40
=54(53+87-40)
=54. 100=5400
12 . 25 + 29 . 25 + 59 . 25
= 25 . ( 12+29+59)
=25 . 90
=2250
43 . 37 + 93 . 43 + 57 . 61 + 69 . 57
= 43.(37+93)+57(61+69)
=43.130+57.130
=130.(43+57)
=130.100
=13 000
12 . 53 + 53 . 172 - 53
=53(12+172-1)
=53.184
=9752
35 . 54 + 35 . 58 + 65 . 75 + 65 . 45
=35(54+58)+65(75+45)
=35.112+65.120
=3920+7800
=11720
39 . 8 + 70 . 3 + 31 . 8
=8(39+31)+70.3
=8.70+70.3
=70.(8+3)
=70.11
=770
2 . 53 . 27 + 6 . 9 . 87 - 3 . 18 . 40
= ( 2 . 27 ) . 53 + ( 6 . 9 ) . 87 - ( 3 . 18 ) . 40
= 54 . 53 + 54 . 87 - 54 . 40
= 54(53+87-40)
= 5400
12 . 25 + 29 . 25 + 59 . 25
= 25( 12 + 29 + 59 )
= 2500
43 . 37 + 93 . 43 + 57 . 61 + 69 . 57
= 43( 37 + 93 ) + 57(61 + 69 )
= 5590 + 7410
= 13000
12 . 53 + 53 . 172 - 53
= 53( 12 + 172 ) - 53
= 9752 - 53
= 9699
35 . 54 + 35 . 58 + 65 . 75 + 65 . 45
= 35( 54 + 58 ) + 65( 75 + 45 )
= 3920 + 7800
= 11720
ĐANG CẦN GIẢI THẬT LÀ NHANH, MỌI NGƯỜI GIÚP MÌNH VỚI
1, -92 - (-192+45+9)
2, (23+(-32-18-22) - (-6)
3, -(81-23+27)-(-41-100)
4, -(-87+12+320)-(-28-1+9)
5, (-4) 9 )-125) 25.(-8)
6, 7.(-25).(-3)2.(-4)
9, (-18)+(-31)+98+|-18|+(-69)
10, 115 - (-85)+53-(-500+53)
@¯\_(ツ)_/¯
1. Có mấy câu thôi mà kêu DÀi
Tớ chịu thôi, khó hiểu lắm. !!!!!!!!!!~T_T~
1 ) \(-92-\left(-192+45+9\right)\) 2 ) \(\left(23+\left(-32-18-22\right)-\left(-6\right)\right)\)
\(=-92-\left(-138\right)\) \(=\left[23+\left(-72\right)\right]-\left(-6\right)\)
\(=-92+138\) \(=-49+6\)
\(=46\) \(=-43\)
3 ) \(-\left(81-23+27\right)-\left(-41-100\right)\) 4 ) \(-\left(87+12+320\right)-\left(-28-1+9\right)\)
\(=-85-\left(-141\right)\) \(=-245-\left(-20\right)\)
\(=56\) \(=-225\)
5 ) Bạn ghi không rõ , mình chưa hiểu