Các câu hỏi tương tự
Tính
A=1x2x3+2x3x3+3x4x3+4x5x3+....+98x99x3
B=1x2+2x3+3x4+4x5+...+98x99
C=1x1+2x2+3x3+4x4+5x5+...+98x98
so sánh A và B:
A=1x2/2x2 x 2x3/3x3 x 3x4/4x4 x 4x5/5x5 x...x2019x2020/2020x2020
B=2020x2021-2021x2019/2021x2017+2021x3
1x1!+2x2!+3x3!+4x4!+...+100x100! = ?
giai thừa nhé
1+(1+2)+(1+2+3)+...+(1+2+...+100) /1x100+2x99+3x98+...+100x1
1+(1+2)+(1+2+3)+. . .+(1+2+3+...+100) / 1x100+2x99+3x98+...+100x1
Tính A =1+(1+2)+(1+2+3)+........+(1+2+3+..........+100) / 100 x 1+99x2+97x3+...........+ 2x99+1x100
So sánh 1 và 1/1x1 +1/2x2 +1/3x3+...+1/100x100
1.Tính giá trị biểu thức
a,2+4+8+16+...+1024
b,1x2+2x3+3x+4x5+... + 14x15
2.Tìm x
a, ( 1+x) + ( 2+x) + ( 4+x) + ( 7+x)+...+(22+x) = 77
b,X + 2 x X+3 x X+4 x+ ... + 100 x X = 15150
c,X x X + 1x1+2x2 + 3x3 + 4x4 + ... +20x20 = 2895
Tính A = 1+( 1+2)+(1+2+3)+..........+(1+2+3+.......+100)
100x1+99x2+97x3+...........+ 2x99+1x100