Toán Lớp 6: (1/1.3 +1/3.5 + 1/5.7 +…+1/97.99) . 2x = 2/3
(1/1.2.3 + 1/2.3.4 + 1/3.4.5 +…+ 1/98.99.100) . x = -3
bài này là tìm x nha mn
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Toán Lớp 6: (1/1.3 +1/3.5 + 1/5.7 +…+1/97.99) . 2x = 2/3
(1/1.2.3 + 1/2.3.4 + 1/3.4.5 +…+ 1/98.99.100) . x = -3
bài này là tìm x nha mn
Comments ( 1 )
(2/1.3+2/3.5+2/5.7+…+2/97.99):2.2x=2/3
(1-1/3+1/3-1/5+1/5-1/7+…+1/97-1/99).x=2/3
(1-1/99).x=2/3
(99/99-1/99).x=2/3
98/99.x=2/3
x=2/3:98/99
x=2/3. 99/98
x=33/49
Vậy x=33/49
(2/[1.2.3] + 2/[2.3.4 ]+…+ 2/[98.99.100]) :2. x = -3
(1/1.2-1/2.3+1/2.3-1/3.4…+1/98.99-1/99.100):2.x=-3
(1/1.2+1/99.100). 1/2.x=-3
1/2.2-1/[99.100.2].x=-3
1/4-1/19800.x=-3
4950/19800-1/19800.x=-3
4949/19800.x=-3
x=-3:4949/19800
x=-3. 19800/4949
x=-59400/4949
Vậy x=-59400/4949