Đáp án:
Giải thích các bước giải:
x x 3 1/3 = 3 1/3 : 4 1/4
x x 3 1/3 = 1/51
x = 1/51 : 3 1/3
x = 3/510
x x (2/1 + 1/5)=8/5
x x 11/5 = 8/5
x = 8/5 : 11/5
x = 8/11
x x 10/3=10/3+17/4
x x 10/3 = 91/12
x = 91/12 : 10/3
x = 91/40
x x 2 + x x 1/5 = 1 3/5
x x 10/5 + x x 1/5 = 8/5
x x ( 10/5 + 1/5 ) = 8/5
x x 11 / 5 = 8/5
x = 8/5 + 11/5
x = 8/11
b = 1/2 + 1/4 + 1/8 + 1/16 + 1/32 +......+ 1/128 + 1/256
b x 2 = (1/2 + 1/4 + 1/8 + 1/16 + 1/32 +......+ 1/128 + 1/256)x 2
b x 2 = 1 + 1/2 + 1/4 + 1/8 + 1/16+ 1/16 + 1/32 +......+ 1/128
b x 2 - b = 1 + 1/2 +1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128
- ( 1/2 + 1/4 + 1/8 + 1/16 + 1/32 +......+ 1/128 + 1/256)
b = 1- 1/256
b = 255 / 256
