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1 efectuati
a) (5x-11x)-(9x-4x+11x)=
b) (-3x²y-7x²y+9x²y)+(-4x²y+3x²y)=
c) -(5xy²-17xy²-8xy²)+(2xy²-3xy²-5xy²)-(-4xy²+6xy²)=
e) (1,8x²-0,5x²)+(1,2x²-2,7x²)-(96x² -0,3x²)=