А (2x+3)/7 -1= (5x-6)/2 -x ОЗ 14 2(2x+3)-14=7(5x-6)-14x 4x+6-14=35x-42-14x 4x-21x=-42+8 -17x=-34 x=2 б 1)(a-2)/(a+2)-(a+2)/(a-2)=[(a-2)²-(a+2)²]/(a²-4)=(a²-4a+4-a²-4a-4)/(a²-4)= =-8a/(a²-4) 2)-8a/(a²-4):1/(a²-4)=-8a/(a²-4)*(a²-4)=-8a в г (93²-2*93*76²)/(-68²+51²+85²-34²)= =(93-76)²/[(85-68)(85+68)+(51-34)(51+34)]= =17²/(17*153+17*87)=17²/[17(153+87)]=17²/(17*240)=17/240 д
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А(2x+3)/7 -1= (5x-6)/2 -x ОЗ 14
2(2x+3)-14=7(5x-6)-14x
4x+6-14=35x-42-14x
4x-21x=-42+8
-17x=-34
x=2
б
1)(a-2)/(a+2)-(a+2)/(a-2)=[(a-2)²-(a+2)²]/(a²-4)=(a²-4a+4-a²-4a-4)/(a²-4)=
=-8a/(a²-4)
2)-8a/(a²-4):1/(a²-4)=-8a/(a²-4)*(a²-4)=-8a
в
г
(93²-2*93*76²)/(-68²+51²+85²-34²)=
=(93-76)²/[(85-68)(85+68)+(51-34)(51+34)]=
=17²/(17*153+17*87)=17²/[17(153+87)]=17²/(17*240)=17/240
д