Question

7. 2/3 × 5/7 +1/4× 3/7 - 7/3× 1/4 = ?
1) 1/21
2) 0
3) 1/28
4)1​

Answer 1

Answer:

0 is the answer....

Step-by-step explanation:

option 2..

Answer 2

Answer:

2/3 x 5/7 + 1/4 x 3/7 - 7/3 x 1/4 =

1/12 x 1/28 x ( 8x28x5/7 + 3x12 - 28x7)

: 1/12 x 1/28 x (8x4x5+36 - 196)

: 1/12 x 1/28 x (160x+36 - 196)

: 1/12 x 1/28 x (160x - 160)

: 1/12 x 1/28 x 160 (x - 1)

: 1/3 x 1/28 x 40 (x - 1)

: 1/3 x 1/7 x 10 (x - 1)

: 1 x 1/3 x 1/7 x (x - 1)

= 1/21 x (x - 1)