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a)x-63:9=18
x-63 =18.9
x-63 =162
x =162+63
x =225
b)3(29-x)+52=103
3(29-x) =103-52
3(29-x) =51
29-x =51:3
29-x =17
x =12
c)|x-1|=4
=>x-1=4 hoặc x-1= -4
=>x=5 hoặc x= -3
d)(-7)-x= -21
x=(-7)-(-21)
x=14
a) x-63;9=18
x-7=18
x=18+7=25
b)3(29-x)=103-52
87-3x=51
-3x=51-87=-36
x=12
c)
* x-1 =4
x=5
* x-1=-4
x=-3
d)(-7)-x=-21
-x=-21+7=14
x=14
1) \(x\div14=36\)
\(\Leftrightarrow x=36\times14\)
\(\Leftrightarrow x=504\)
Vậy x = 504
2) \(x\div6=52\)
\(\Leftrightarrow x=52\times6\)
\(\Leftrightarrow x=312\)
Vậy x = 312
3) \(x\div12=42\)
\(\Leftrightarrow x=42\times12\)
\(\Leftrightarrow x=504\)
Vậy x = 504
4) \(x\div15=0\)
\(\Leftrightarrow x=0\times15\)
\(\Leftrightarrow x=0\)
Vậy x = 0
5) \(4x\div101=28\)
\(\Leftrightarrow4x=28\times101\)
\(\Leftrightarrow4x=2828\)
\(\Leftrightarrow x=2828\div4\)
\(\Leftrightarrow x=707\)
Vậy x = 707
6) \(7x\div28=5\)
\(\Leftrightarrow7x=5\times28\)
\(\Leftrightarrow7x=140\)
\(\Leftrightarrow x=140\div7\)
\(\Leftrightarrow x=20\)
Vậy x = 20
7) \(15x\div60=3\)
\(\Leftrightarrow15x=3\times60\)
\(\Leftrightarrow15x=180\)
\(\Leftrightarrow x=180\div15\)
\(\Leftrightarrow x=12\)
Vậy x = 12
8) \(774\div x=18\)
\(\Leftrightarrow x=774\div18\)
\(\Leftrightarrow x=43\)
Vậy x = 43
9) \(432\div x=27\)
\(\Leftrightarrow x=432\div27\)
\(\Leftrightarrow x=16\)
Vậy x = 16
10) \(1751\div x=103\)
\(\Leftrightarrow x=1751\div103\)
\(\Leftrightarrow x=17\)
Vậy x = 17
11) \(1122\div x=33\)
\(\Leftrightarrow x=1122\div33\)
\(\Leftrightarrow x=34\)
Vậy x = 34
12) \(1525\div x=61\)
\(\Leftrightarrow x=1525\div61\)
\(\Leftrightarrow x=25\)
Vậy x = 25
_Chúc bạn học tốt_
1)x - 26 =95 2)79 - x = 65 3)119 - x =97 4) (x - 67) -23 =10
x =95+26 x=79-65 x =119-97 x - 67 =10+23 =33
x =121 x=14 x =22 x =33+67
x =100
\(\left|x-11\right|=7\)
\(\Leftrightarrow\orbr{\begin{cases}x-11=7\\x-11=-7\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=18\\x=4\end{cases}}\)
d,\(\left(3x-12\right)\left(x+31\right)=0\)
\(\Rightarrow\orbr{\begin{cases}3x-12=0\\x+31=0\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=4\\x=-31\end{cases}}\)
Bài 2 : So sánh:
107500 = 1012.625 = ( 1012)625
115000 = 118.625 = ( 118)625
Dễ thấy 1012 > 118 nên 107500 > 115000
Chúc bạn học tốt!!!
Bài 2: (2 điểm) Tìm x biết:
a) \(x-63\div9=18\)
\(\Rightarrow x-7=18\)
\(\Rightarrow x=25\)
Vậy \(x=25\)
b) \(3\left(29-x\right)+52=103\)
\(\Rightarrow3\left(29-x\right)=51\)
\(\Rightarrow29-x=17\)
\(\Rightarrow x=12\)
Vậy \(x=12\)
c) \(\left|x-1\right|=4\)
\(\Rightarrow\left[{}\begin{matrix}x-1=4\\x-1=-4\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=5\\x=-3\end{matrix}\right.\)
Vậy \(x=5\) hoặc \(x=-3\)
d) \(\left(-7\right)-x=-21\)
\(\Rightarrow x=-28\)
Vậy \(x=-28\)
Chúc bạn hok tốt !!! Nguyễn Thanh Hằng
bai1:
b)(20^2-10^2.2):10.3-21:x=57
(400-100.2):10.3-21:x=57
(400-200):10.3-21:x=57
200:10.3-21:x=57
20.3-21:x=57
60-21:x=57
21:x=60-57
21:x=3
x=21:3=7
1
b;
B=1+ (7-5) + (11-9) + ...+(101-99)
B=1+2+2+..+2
B=1+25.2=51
2.
a.
ĐK : x+2 >=0 => x>=-2
\(\left|x+2\right|-x=2\\ \Rightarrow\left|x+2\right|=2+x\\ \Rightarrow\left[{}\begin{matrix}x+2=x+2\\x+2=-x-2\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}0x=0\\2x=-4\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}0x=0\\x=-2\end{matrix}\right.\)
Vậy x=-2
a. x = 120
b. x = 22
c. x = 20
d. x = 17
a) x - 57 = 63
x = 63 + 57
x = 120
b)119 - x = 97
x = 119 -97
x = 22
c) 7.x : 28 = 5
7.x = 28x5
7.x = 140
x= 140 : 7
x= 20
d) 1751: x = 103
x = 1751 : 103
x = 17