( x . 51 ) + ( 2 + 4 + ... + 100 ) = 2601
51x + 2550 = 2601
51x = 2601 - 2550
51x = 51
=> x = 1
Vậy x = 1
100x+(1+2+3+4+....+100)=2601
100x+[(100-1):1+1]=2061
100x+100=2601
100x+[(100+1).100:2]=2601
100x+5050=2
( x . 51 ) + ( 2 + 4 + ... + 100 ) = 2601
51x + 2550 = 2601
51x = 2601 - 2550
51x = 51
=> x = 1
Vậy x = 1
100x+(1+2+3+4+....+100)=2601
100x+[(100-1):1+1]=2061
100x+100=2601
100x+[(100+1).100:2]=2601
100x+5050=2
Bài 6 Tìm x
1) ( x+1 ) + ( x+2 ) + ( x+3 ) + ... + ( x+100 ) = 5750
2) ( 2x-1 ) + ( 4x-2 ) + ... + ( 200x - 100 ) = 5050
3) ( x+2 ) + ( x+4 ) + ( x+6 ) + ... + ( x + 100) = 2650
1/2 x -2/3 x 3/4 x -4/5 x 5/6 x -6/7 x ....x 99/100 = ?
tìm số tữ nhiên x thỏa mãn :
1+3+5+.....+x=2601
A=2 x 6 x 10 + 4 x12 x 20 +6 x 18 x 30 + ...+ 20 x 60 x 100 / 1 x 2 x 3 + 2 x 4 x 6 + 3 x 6 x 9 +...+ 10 x 20 x 30
Khó lắm đấy . Ai giải được bái luôn
tìm x :1+3+5+...+(2x+1)=2601
tìm x :1+3+5+...+(2x+1)=2601
Tính tổng : 1 x 2 + 2 x 4 + 4 x 6 + .........+ 98 x 100
8 x (-3) x (-5) x 7 - 4 x (-5) x 3 - 6 x (-4) x 8 x 9 -100 x (-2)
Tìm x
7 . x - 2. x = 6^17 : 6^15 + 44 : 11
100 - ( 2 . x + 6) . 2 = 4^2