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1) x - 36 + 12 = - x+ 10
=> x + x = 10 + 24
=> 2x = 34
=> x = 34/2 = 17
2) (x + 15) - (11 - x) = (-2)2
=> x + 15 - 11 + x = 4
=> 2x = 4 - 4
=> 2x = 0
=> x = 0
3) 40 - 4x2 = (-6)2
=> 40 - 4x2 = 36
=> 4x2 = 40 - 36
=> 4x2 = 4
=> x2 = 1
=> x = \(\pm\)1
4) (-50) + 10x2 = (-25) x |-2|
=> -50 + 10x2 = -50
=> 10x2 = -50 + 50
=> 10x2 = 0
=> x2 = 0
=> x = 0
5) |x + 1| = 2020
=> \(\orbr{\begin{cases}x+1=2020\\x+1=-2020\end{cases}}\)
=> \(\orbr{\begin{cases}x=2019\\x=-2021\end{cases}}\)
6) (x + 1)5 + 8 = 0 (xem lại đề)
7) (-20) + x3 : 16 = -24
=> x3 : 16 = -24 + 20
=> x3 : 16 = -4
=> x3 = -4 . 16
=> x3 = -64 = (-4)3
=> x = -4
9) x14 = x17
=> x14 - x17 = 0
=> x14(1 - x3) = 0
=> \(\orbr{\begin{cases}x^{14}=0\\1-x^3=0\end{cases}}\)
=> \(\orbr{\begin{cases}x=0\\x=1\end{cases}}\)
10) (-36) + (1 - x)2 = 0
=> (1 - x)2 = 36
=> (1 - x)2 = 62
=> \(\orbr{\begin{cases}1-x=6\\1-x=-6\end{cases}}\)
=> \(\orbr{\begin{cases}x=-5\\x=7\end{cases}}\)
sau 58 ,7,50 ,2,-60 là phép tính khác .
mấy b giúp mk nha ?
( 17 - 165 - 59 ) - ( 17 - 59 )
= ( -152 - 59 ) - ( -42 )
= ( -152 + -59 ) + 42
= ( - 211 ) + 42
= -169
23 . 7 + 23 . 14 - 8
= 8 .7 + 8 . 14 - 8 .1
= 8 . ( 7 + 14 -1 )
= 8 . 20
= 160
715 : 713 + 24 . 2 - 20080
= 49 + 16 . 2 - 1
= 49 + 32 - 1
= 81 - 1
= 80
27 - 3 . (x+2) = 6
3 . (x+2) = 27 - 6
3 . (x+2) = 21
x+2 = 21 : 3
x + 2 = 7
x = 7 - 2
x = 5
9|x| - 17 = 20 : |-2|
9|x| - 17 = |-20|
9 . |x| = |-20| + 17
9 . |x| = |-3|
|x| = 9 : |-3|
|x| = |-3|
Vậy |x| = |-3| , |3|
\(a.=17-165-59-17-59\)
\(=0-165-0\)
\(=-165\)
\(b.=7^2+2^5-1\)
\(=49+32-1\)
\(=80\)
\(c.=2^3\left(4+14-1\right)\)
\(=2^3.17\)
\(=8.17\)
\(=136\)
\(d.3\left(x+2\right)=21\)
\(x+2=7\)
\(x=5\)
\(e.9|x|-17=20:2\)
\(9|x|-17=10\)
\(9|x|=27\)
\(|x|=3\)
\(\Rightarrow x=\pm3\)
(17-165-59) -(17-59)
= -( 207 ) - ( - 42 )
= - ( 207 - 42 )
= -165
715:713+24.2-20080
= 72 + 25 - 1
= 49 + 32 - 1
= 80
23.7+23.14-8
= 23 . ( 7 + 14 ) - 8
= 23 . 21 - 8
= 8 . 21 - 8
= 168 - 8
= 160
27-3 (x+2) = 6
3 ( x + 2 ) = 27 - 6
3 ( x +2 ) = 21
x + 2 = 21 : 3
x + 2 = 7
x = 7 - 2
x = 5
Vậy x = 5
9|x|-17=20:|-2|
9 |x| - 17 = 20 : 2
9 |x| - 17 = 10
9 |x| = 10 + 17
9 |x| = 27
|x| = 27 : 9
|x| = 3
x = -3
Vậy x = -3
Hok tốt !!
số sh cua tong A bang so hang cua day so cach deu 1 don vi tu 1 den 60
so sh cua tong A la:(60-1):1+1=60 (sh)
Cu 3 sh lien tiep cua tong A nhom thanh 1 nhom thi ta duoc so nhom la : 60: 3=20(nhom)
khi do : A = (2+2^2+2^3)+(2^4+2^5+2^6)+(2^7+2^8+2^9)+....+(2^58+2^59+2^60)
A=(2+2.2+2.2^2)+(2^4+2^4.2+2^4.2^2)+(2^7+2^7.2+2^7.2^2)+.....+(2^58
2^58.2+2^58.2^2)
A=2(1+2+2^2)+2^4(1+2+2^2)+2^7(1+2+2^2)+...+2^58(1+2+2^2)
A=2.7+2^4.7+2^7.7+...+2^58.7
A=7(2+2^4+2^7+...+2^58)
Vi 7 chia het cho 7
2+2^4+2^7+...+2^58 thuoc N
Suy ra 7(2+2^4+2^7+...+2^58) chia het cho 7
hay A chia het cho 7
Vay A chia het cho 7
Câu 1:
abc >/ 100 ; bca >/ 100 ; cab>/100
< = > abc + bca + cab >/300
< = > abc + bca + cab >/ 111
a) 102 : 108 . 117
k biết làm :
164 : 43
= 48 : 43
= 45
39 : 38 . 32 . 15
= 3 . 32
= 33
51 . 516 : 514 . 50
= 517 : 514 . 1
= 53
1143 : 1142 . 112
= 11 . 112
= 113
125 . 124 : 127 . 12
= 129 : 127 . 12
= 122 . 12
= 123
\(a)47-\left[\left(45.2^4-5^2.12\right):14\right]\)
\(=47-\left[\left(45.16-25.12\right):14\right]\)
\(=47-\left[\left(720-300\right):14\right]\)
\(=47-\left[420:14\right]\)
\(=47-30\)
\(=17\)
\(b)50-\left[\left(20-2^3\right):2+34\right]\)
\(=50-\left[\left(20-8\right)\right]:2+34\)
\(=50-\left[12:2+34\right]\)
\(=50-\left[6+34\right]\)
\(=50-40\)
\(=10\)
\(c)10^2-\left[60:\left(5^6:5^4-3,5\right)\right]\)
\(=10^2-\left[60:\left(5^2-3,5\right)\right]\)
\(=10^2-\left[60:\left(25-3,5\right)\right]\)
\(=10^2-\left[60:21,5\right]\)
\(=100-\dfrac{120}{43}\)
\(=\dfrac{4180}{43}\)
\(d)50-\left[\left(50-2^3.5\right):2+3\right]\)
\(=50-\left[\left(50-8.5\right):2+3\right]\)
\(=50-\left[\left(50-40\right):2+3\right]\)
\(=50-\left[10:2+3\right]\)
\(=50-5+3\)
\(=50-8\)
\(=42\)
\(e)10-\left[\left(8^2-48\right).5+\left(2^3.10+8\right)\right]:28\)
\(=10-\left[\left(64-48\right).5+\left(8.10+8\right)\right]:28\)
\(=10-\left[16.5+\left(80+8\right)\right]:28\)
\(=10-\left[80+88\right]:28\)
\(=10-168:28\)
\(=10-6\)
\(=4\)
\(f)8697-\left[3^7:3^5+2.\left(13-3\right)\right]\)
\(=8697-\left[3^2+2.\left(13-3\right)\right]\)
\(=8697-\left[9+2.10\right]\)
\(=8697-9+20\)
\(=8697-29\)
\(=8668\)
\(g)2011+5\left[300-\left(17-7\right)^2\right]\)
\(=2011+5.\left[300-10^2\right]\)
\(=2011+5.\left[300-100\right]\)
\(=2011+5.200\)
\(=2011+1000\)
\(=3011\)
\(h)695-\left[200+\left(11-1\right)^2\right]\)
\(=695-\left[200+10^2\right]\)
\(=695-200+100\)
\(=695-300\)
\(=395\)
\(i)129-5\left[29-\left(6-1\right)^2\right]\)
\(=129-5\left[29-5^2\right]\)
\(=129-5\left[29-25\right]\)
\(=129-5.4\)
\(=129-20\)
\(=109\)
lm ơn ik có ai giúp me ko me cần gấp
ai mà giúp tui thả tim hết dù đúng hay sai