Question

5xy²-{2x²y-[3xy²-(4xy²-2xy²)]}=

Answer 1

5xy²-{2x²y-[3xy²-(4xy²-2xy²)]}
=5xy²-(2x²y-3xy²+4xy²-2xy²)
=6xy²-2x²y;

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Answer 2

解：5xy²-{2x²y-[3xy²-(4xy²-2xy²)]}
＝ 5xy²-[2x²y-(3xy²-4xy²+2xy²)]
= 5xy²-(2x²y-3xy²+4xy²-2xy²)
=5xy²-2x²y+3xy²-4xy²+2xy²
=6xy²-2x²y

Answer 3

5xy²-{2x²y-[3xy²-(4xy²-2xy²)]}
=5xy²-[2x²y-(3xy²-4xy²+2xy²)]
=5xy²-(2x²y-3xy²+4xy²-2xy²)
=5xy²-2x²y+3xy²-4xy²+2xy²
=6xy²-2x²y