Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a= 506 -732 +(-2000)-506+1732= (1732 -732) + (506-506) +(-2000) = 1000+0+(-2000)=-1000
B= 1037 +(743 - 1031 + 57 ) =1037 + 743-1031+57=806
Bai 1:
a) (x - 6)2 = 9
(x - 6)2 = 32
=> x - 6 = 3
x = 3 + 6
x = 8
Vay x = 8
b) (2x - 130) : 4 + 213 = 52 + 193
(2x - 130) : 4 + 213 = 25 + 193
(2x - 130) : 4 + 213 = 218
(2x - 130) : 4 = 218 - 213
(2x - 130) : 4 = 5
(2x - 130) = 5 . 4
(2x - 130) = 20
2x = 20 + 130
2x = 150
x = 150 : 2
x = 75
Vay x = 75
c) | 3x - 15| = 0
=> 3x - 15 = 0
3x = 0 + 15
3x = 15
x = 15 : 3
x = 5
Vay x = 5
Bai 2:
a) (17 - 229) + ( 17 - 25 + 229)
= 17 - 229 + 17 - 25 + 229
= 17 + (-229) + 17 + (-25) + 229
= [ 229 + (-229) ] + [17 + 17 + (-25) ]
= 0 + 9
= 9
b) - (269 - 357) + (269 - 357)
= - 269 + 357 + 269 - 357
= - 269 + 357 + 269 + (-357)
= [ 269 + (-269) ] + [ 357 + (-357) ]
= 0 + 0
= 0
c) (125 - 679 + 145) - (125 - 679)
= 125 - 679 + 145 - 125 + 679
= 125 + (- 679) +145 + (-125) + 679
= [ 679 + (-679) ] + [ 125 + (-125) ] + 145
= 0 + 0 + 145
= 145
a)2575 + 37 + 2576 -29
= ( 2575 - 2576 ) + ( 37 - 29)
= -1+ 8
= 8-1
= 7
a) \(53.\left(-15\right)+\left(-15\right).47=\left(-15\right).\left(53+47\right)=\left(-15\right).100=-1500\)
b) \(\left(-43\right).92-46.27+46.41=\left(-86\right).46-46.27+46.41\)
\(=46\left[\left(-86\right)-27+41\right]=46.\left(-72\right)=-3312\)
c) \(\left(-72\right)\left(15-49\right)+15\left(-56+72\right)=\left(-72\right).15-72.49+15.\left(-56\right)+15.72\)
\(=\left[\left(-72\right).15+15.72\right]-72.49-15.56=0-3528-840=4368\)
d) \(\left(-2^4\right).17.\left(-3\right)^0.\left(-5\right)^6\left(-1^{2n}\right)=16.17.1.12625.\left(-1^{2n}\right)\)
a,\(53.\left(-15\right)+\left(-15\right).47\)
\(=-15.\left(53+47\right)=-15.100=-1500\)
\(b,-43.92-46.27+46.41\)
\(=-43.92-\left[46.\left(27-41\right)\right]=-43.92-\left[46.\left(-14\right)\right]\)
\(=-3956+644=-3312\)
\(c,-72\left(15-49\right)+15\left(-56+72\right)\)
\(=-15.72+49.72+15.\left(-56\right)+15.72\)
\(=72.\left(-15+49+15\right)-15.56=3528-840=2688\)
a)=27+65+346-27-65
=(27-27)+(65-65)+346
=0+0+346
=346
b)=42+69-17-42+17-35
=(42-42)+(17-17)+(69-35)
=0+0+34
=34
a) 53.(-15)+(-15).47
=53.[(-15)+(-15)].47
=53.(-30).47
=-1590.47
=-74730
a)17.65+17.35-x=1570
17.(65+35)-x=1570
17.100-x=1570
1700-x=1570
x=1700-1570=130
b)x+16.14+9.4=7.9.12+63.88
x+224+36=756+5544
x+260 =6300
x=6300-260=6040
c)x.2^3=2^6
x =2^6:2^3
x =2^3=8
Câu 1:
a, |a+3|=7
\(\Rightarrow\orbr{\begin{cases}a+3=7\\a+3=-7\end{cases}}\Rightarrow\orbr{\begin{cases}a=4\\a=-11\end{cases}}\)
Vậy \(a\in\left\{4;-11\right\}\)
b. |a+5|=-5+8
\(\Rightarrow\left|a+5\right|=3\)
\(\Rightarrow\orbr{\begin{cases}a+5=3\\a+5=-3\end{cases}}\Rightarrow\orbr{\begin{cases}a=-2\\a=-8\end{cases}}\)
Vậy \(a\in\left\{-2;-8\right\}\)
Câu 2: a, 2575+37-2576-29
=(2575-2576)+(37-29)
=-1+8=7
b, 34+35+36+37-14-15-16-17
=(34-14)+(35-15)+(36-16)+(37-17)
=20+20+20+20=20.4=80
Học tốt
a)-35+(-4).4.5+(-2)5
=-35-4.4.5+(-32)
=-35-16.5-32
=-35-80-32
=-115-32
=-147
b)-(238)+113-213-(122)
=-234+113-213-122
=-121-213-122
=-334-122
=-456
c)17.(-27)+(-17).73
=-17.27+(-17).73
=-17.(27+73)
=-17.100
=-1700
Bn giải giúp mk lại ý B nhé:))