Verified answer

Ответ:

a)45x+45y=45(x+y)45(9,7+11,3)=45•21=945

b)-29b+58a=29(-b+2a)=29(-7,85+8,35)=29•0,5=14,5

c)mn-m²=m(n-m)=-4,73(5,27-4,73)=-4,73•0,54=-2,5542

d)x²y-x³=x²(y-x)=(-1,2)²(3,8+1,2)=1,44•5=7,2

e)35a³b-4a²b²+20a³b²=a²b(35a-4b+20ab)=4•5(35•2-4•5+20•10)=20(70-20+20)=20•70=1400

f)40x²y-80xy²-160x²y²=40xy(x-2y-4xy)=40•0,5(-1,25(0,5+2,5+4•0,5•(-1,25))=-2,5(3-2,5)=-2,5•0,5=-1,25