\(\text{29-3.(x+4)=23}\\ 3\left(x+4\right)=29-23\\ 3\left(x+4\right)=6\\ x+4=2\\ x=2-4\\ x=-2\)
\(\Rightarrow3.\left(x+4\right)=6\)
\(\Rightarrow x+4=2\)
\(\Rightarrow x=2-4\)
\(\Rightarrow x=-2\)
A=((2-2/19+2/23-1/1010)/(3-3/19+3/23-3/2020))x((4-4/29+4/41-1/505)/(5-5/29+5/41-1/404))
giúp mình với
7) -29.(85-47)-85.(47-29)
8) -15.(23-29)+23-(15-29)
9) -13.(55-29)+23.(15-29)
13)-10.(2+4)-5.(4-3)
Tìm số nguyên x, biết :
a, 3x - 75 = 45 + 3 . ( -25 )
b, 2 . ( -7 ) -11 = 6x + 17
c, 37 . ( 29 - 23 ) - 29 . ( 37 - 23 )
d, -4 . /x-3/=-48
A. 28 x ( 29 - 23 ) - 29 x ( 28 - 23 )
B. 15 x ( 16 - 222 ) - 16 x ( 15 - 222 )
C.( - 1 ) + 2 + ( -3 ) + 4 + ( - 5 ) + 6 + ....+ ( - 99 ) + 100
D/ 5 - 10 + 15 - 20 + 25 - .... + 105 - 110
E/ 1 - 2 + 3 - 4 + ... + 43 - 44 + 45
Giải giúp nhé ! Cảm ơn !
Tìm số tự nhiên x, biết:
a) (x- 29) - 11 = 0;
b) 231 + (312 - x) = 531
c) (4 . x + 5) : 3 - 121 : 11 = 4
d) 131. x - 941 = 27 . 23
\(\dfrac{29-x}{21}\)+\(\dfrac{27-x}{23}\)+\(\dfrac{25-x}{25}\)+\(\dfrac{23-x}{27}\)+\(\dfrac{21-x}{29}\)=\(\dfrac{(29-x+1}{21}\)+\(\dfrac{(27-x+1)}{23}\)+\(\dfrac{(25-x+1)}{25}\)+\(\dfrac{(23-x+1)}{21}\)=-5 +5
GIẢI nốt hộ mình với ạ
Bài 1:Thực hiện phép tính :
a) 11 3/4 - ( 6 5/6 - 4 1/2) + 1 2/3
b)2 17/20 - 1 11/15 + 6 9/20 : 3
c) 4 3/7 : ( 7/5 x 4 3/7)
d)( 3 2/9 x 15/23 x 1 7/29) : 5/23
1)x+7/12=17/18-1/9
2)29/30-(13/23+x)=7/69
3)×/15=4/10
4)×-3/49=-2/7
5)×/3=1/y
Rút gọn:
A=\(\frac{2-\frac{2}{19}+\frac{2}{23}-\frac{1}{1010}}{3-\frac{3}{19}+\frac{3}{23}-\frac{3}{2020}}\)\(.\frac{4-\frac{4}{29}+\frac{4}{41}-\frac{1}{505}}{5-\frac{5}{29}+\frac{5}{41}-\frac{1}{404}}\)
