(6x + 35 ) = 330 : 6
6x+35=55
6x=55-35
6x=20
x=20:6
x=10/3
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(6x + 35 ) = 330 : 6
6x+35=55
6x=55-35
6x=20
x=20:6
x=10/3
\(B=\frac{2}{1x2}+\frac{2}{2x3}+...+\frac{2}{100x101}\)
tính : 1x2 + 2x3 + ..... + 100x101 =
1/1x2 + 1/2x3 + 1/3x4 + ... + 1/99x100 + 1/100x101 = ...
Tính:
A=1x2+2x3+3x4+4x5+......+99x100+100x101
1/1X2 + 1/2X3 + 1/3X4 +...+1/99X100+ 1/100X101
\(\)Tính
\(\frac{1}{1x2}x\frac{4}{2x3}x\frac{9}{3x4}x.......x\frac{10000}{100x101}\)
2/1x2+2/2x3+2/3x4+....+2/1999x2000
A=2/1x2 + 2/2x3 + 2/3x4 + ... + 2/9x10
c = 2 /1x2 + 2/2x3 +2/3x4 +2/4x5 +2/5x6 + 2/6x7