Wykonaj działania i oblicz wartość liczbową wyrażenia: 4(y-3)-3(x+1)= dla x=4,y=2 3(2b+1)-4(a-2)= dla a=7, b=1 9(x-7y)-(5y-2x)+20y= dla x=0,5, y=0,3 (5x+7y)-8(y+1)+3(x-y)= dla x=1/2 , y=1/4
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1) 4(y-3)-3(x+1)= 4*y-12-3x-3=4*2-12-3*4-3=8-12-12-3=-19
2)9(x-7y)-(5y-2x)+20y=9*x-63y-(5y-2x)=9*0,5-63*0,3-(5*0,3-2*0,5)=3-18,9-(1,5-1)=16,9-1=15,9
3)(5x+7y)-8(y+1)+3(x-y)=5*0,5+7*0,25-8*0,25-8+3*0,5-3*0,25=2,5+1,75-2-8+1,5-
0,75=-5