4 задание,помогите пожалуйста. Created by natali2002ivanova. matematika-ru

4 задание,помогите пожалуйста...

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1)(a-3b)²/(4a-24b)-4a=(a²-6ab+9b²-16a²+96ab)/(4a-24b)=
=(-15a²+90ab+9b²)/(4a-24b)=-3(5a²-30ab-3b²)/[4(a-6b)]
2)-3(5a²-30ab-3b²)/[4(a-6b)] * 8(7a-6)/[3(a+6b)] * (a-6b)(a+6b)/(3a²-3ab-3b²)=
=-2(7a-6)=12-14a
a=1/7,b=-6/7
12-14*1/7=12-2=10

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