Question

7 by 11 into minus 4 by 5 + 2 by 3 into 6 by 7 minus 2 by 5 into 2 by 3

Answer 1

7/11 × -4/5 + 2/3 × 6/7 - 2/5 × 2/3
= -28/55 + 4/7 - 4/15
= (-588 + 660 - 308 )/1155
= -296/1155

Answer 2

HI FRIEND,
[7/11*-4/5]+[2/3*6/7]-[2/5*2/3]
[-28/55]+[12/21]-[4/15]
L.C.M of 55,21,15 is 1155
[-28*21/55*21]+[12*55/21*55]-[4*77/15*77]
[-588/1155]+[660/1155]-[308/1155]
[-588+660-308/1155]
[-236/1155]
I HOPE IT HELPS U 
MARK AS BRAINLIST IF U LIKE
:)