A=-4/7.2/9+-4/7.7/9+18/7
= -4/7.(2/9+7/9)+18/7
= -4/7.1+18/7=-4/7+18/7=14/7=2
A= -4/7. 2/9+ -4/7.7/9 + 18/7
A =-4/7.(2/9+7/9)+18/7
A =4/7.1+18/7
A=4/7+18/7
A=22/7
A= -4/7. 2/9+ -4/7.7/9 + 18/7
A=-4/7(2/9+7/9)+18/7
A= -4/7. 1 +18/7
A=-4/7 + 18/7
A=14/7
A=2
Vậy A=2
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-4/7.2/9+ -4/7.7/9+18/7
=-4/7(2/9+7/9)+18/7
= -4/7 .1+18/7
= -4/7+18/7
=14/7=2