przekształc wyrażenia na sumę i zredukuj wyrazy podobne
a) 5a(-2b+6)-3b(a-4
b)x(7x-8)9(x^2-3x
c)0,1m(-2p+4m)-0,2(3m-5p
d)4y(3a-5b)+(-2y+1)*3a+18by
e)7x(x/7+2y/7)-8(3x/8-5y/8)
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a) 5a(-2b+6)-3b(a-4)=
=-10ab+30a-3ab+12b=
=-13ab+30a+12b
b) x(7x-8)9(x^2-3x)=(7x^2-8x)(9x^2-27x)=
=63x^4-189x^3-72x^3+216x^2=
=63x^4-261x^3+216x^2
c) 0,1m(-2p+4m)-0,2(3m-5p)=
=-0,2mp+0,4m^2-0,6m+1p
=0,4m^2-0,2mp-0,6m+1p
d) 4y(3a-5b)+(-2y+1)*3a+18by=
=12ay-20by-6ay+3a+18by=
=6ay-2by+3a
e) 7x(x\7+2y\7)-8(3x\8-5y\8)=
7x^2\7-14xy\7-24x\8+40y\8=
=2x^4y-8xy