1x32+7x8+4x=200x
1x2=? 2x3=? 3x4=? 4x5=?
5x6=? 6x7=? 7x8=? 8x9=?
ai xong kb
tính nhanh
1/6x7+1/7x8+1/8x9+1/9x10+1/10x11
Tính 1/(5x6)+ 1/(6x7)+1/(7x8)+1/(8x9)+1/(9x10)
1/4x5+1/5x6+1/6x7+1/7x8+1/8x9+1/9x10
A = 1/2x3 + 1/3x4 + 1/4x5 + 1/5x6 + 1/6x7 + 1/7x8
Tính nhanh
1x2x3x4x5x6:7x8-9+10x(1+2+3+4+5) (tính dưới 10 dòng )
1/2x3 + 1/3x4 + 1/4x5 +1/5x6 +1/6x7+1/7x8 + 1/8x9
D = 3/3x4 + 3/4x5 + 3/5x6 + 3/6x7 + 3/7x8 + ... + 3/29x30