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b) -11
c) -8,9
d) -7
b)3(2*1+1)-4(7-2)=3*3-4*5=9-20 = -11
c)9(0,5-7*0,3)-(5*0,3-2*0,5)+20*0,3= -8,9
d)(5*0,5+7* 0,25)-8*(0,5+1)+3*(0,5-0,25)= -7