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2.x³+y³-3z³+1-2x³-3y³-7z²=x³-2x³+y³-3y³-3z³-7z²+1=-x³-2y³-3z³-7z²+1
1.5x-7x-7+11=5x-7x-7+11=-2x+4
2.13x³-12x³-8x²+9x²-5+4=x³+x²-1
blm paham
1.(x-6)((2x+5)=2x²+5x-12x-30=2x²-7x-30
1.(x-3y)(x+3y)=x²+3xy-3xy-9y²
=(x×x) +(3×x×y) -(3×x×y) -(9×y)
1.-5(x-3y+2)=-5x+15y-10
2.2xy(x²-3)=2x³-6xy
maaf sebelumnya jika salah
semoga membantu