ta có 1+2+3+4+...+x
=(x*(x+1))/2=120
=x*(x+1)=240
=>x=15;x+1=16
( 1 + x ) . x : 2 = 120
=> ( 1 + x ) . x = 120 . 2 = 240
=> x = 15
1+2-3-4+...+97+98-99-100
nhanh len minh tick cho nhe
\(3^2.x+2^3-4,5+3\frac{1}{2}x=16x+2^3-4,5-15x+6,2\)
ban nao tra loi minh tick cho nhanh len nhe
Tim x :
2/x-1/+5=15
7x-14=3x=22
Ai lam xong dau tien thi minh tick cho nhe
giup minh 2 cau nay nhe ^^
1) 120 + ( (999-9x) : 60 ) x ( day la dau nhan ) 24= 480. Tim x
2) 3( x-9 ) + 15 = 12 + 243 : 32. Tim x
Giup mk nhe>.<!!!
Mk dang GAP!!!!!
so cac so co 3 chu so khong chia het cho 5
tra loi nhanh ho minh minh se tick cho 7 cai nhe mau len
tim x thuoc Z biet:
|x-5|+x+3=16
|x-4|>x+2
||x+5|-4|=3
Cach lam nua nhe
minh chua biet cach lam,cac ban phaiviet cach lam vao minh moi tick
ko bat buoc lam tat ca cac cau
Chung to A = 1 x 2 + 2 x 3 + 3 x 4 + ..... + n x [ n + 1 ] = {[n x [ n + 1 ] x [ n + 2 ] }/3 , n > 0
Cac ban nhanh len nhe ngay mai minh phai nop roi . Ai lam nhanh , dung dau tien minh cho 1 tich
Ai giai minh cho 2 tick nha.Nhanh Len Nhe
\(\left(6x\right)^3:8\text{= }\left(2x-1\right)^3\)
tim x biet
/x+2/=/x-2/
minh biet dap an la 0 nhung trinh bay kieu gi
giup minh nhe, nhanh len minh can gap