Đáp án:
Giải thích các bước giải:
A= -5/7 . 2/11+ -5/7 . 9/11 +1,5/7
= -5/7 . 2/11 + -5/7 . 9/11+ 12/7
= -5/7 .( 2/11 + 9/11 ) +12/7
= -5/7 . 11/11 + 12/7
= -5/7 . 1 + 12/7
= -5/7 + 12/7
= 7/7 = 1
B = 50% -1,1/3 .20 .7/35 . 0,75
= 50/100-4/3 . 20/1 . 7/35 .75/100
= 1/2 -4/3 .20/1 .1/5 .3/4
=[1/2 + (-4/3) ].20/1 . 1/5. 3/4
=11/6 . 20/1 .1/5 .3/4
= 110/3 .1/5 . 3/4
= 22/3 . 3/4
= 11/2
