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a (a+2b-3) -b (2a+b-6) + 3 (a-2b)=
a²+2ab-3a-2ab-b²+6b+3a-6b=a²-b²=(-1)²-(1/2)²=
=1-1/4=3/4
-10*-1/2-3-2*-1*1/2+1/2*1/2+3*-1=-5-3+1-3+1/4=-9 i 3/4
• a= -1 i b=½ .
1 - 0,25 = 0,76
Odp: Wartoś wyrażenia wynosi 0,75
;) prosze o naj ;]