tìm x biết: (x + 1) + (x + 6) + (x + 11) + ... + (x + 31) + (x + 36) = 228
tìm X
a, 2448 : [119-(X-6)]=24
b,(X-21) x 13 : 11=39
Tìm x biết: (x+1) + (x+6) + (x+11) +...+(x+31) + (x+36) = 228
Tìm x biết: (x+1) + (x+6) + (x+11) +...+(x+31) + (x+36) = 228
BÀi 7 tìm số tự nhiên x biết
d) 35 : ( 2x x + 3) - 3 = 11 - 9 x 2,5 x 0,4; 8xx+ 4xx- 44=100; 5xx+ 3xx+ 4 = 68
e) ( x+1) + ( x+2) ....... + ( x + 211) = 23632
f) (1+3+5+7+........+2009) + x = 1010026
bài 8: tính hợp lí
( 98x 7676 - 9898 x 76) : ( 2+4 +6+........+200)
Tìm x thỏa mãn :[x+1]+[x+3]+[x+5]+[x+7]+[x+9]+[x+11]+[x+13]=119
Tìm x:
a, \(\left(x+1\right)+\left(x+3\right)+\left(x+5\right)+\left(x+7\right)+\left(x+9\right)=75\)
b, \(\left(x+1\right)+\left(x+6\right)+\left(x+11\right)+...+\left(x+31\right)+\left(x+36\right)=288\)
1. 27/5 x 91/12 x 125/9 x 96/13
2. 2539/35 x 7/90 + 561/35 x 7/90
3. 31/7 : (2/5 x 31/7)
4. (29 x 15/23 x 36/29) : 5/23
5. 4/3 x 5/4 x 6/5 x ... x 12/11
6. 34/11 x 27/46 x 23/17 x 22/9
7. 4/3 x 9/8 x 16/15 x 25/24 x ... x 100/99