-3x²-4x²y与-3x²+2x²y的差为

-3x²-4x²y与-3x²+2x²y的差为
-3x²-4x²y与-3x²+2x²y的差为

-3x²-4x²y与-3x²+2x²y的差为
-3x²-4x²y与-3x²+2x²y的差为
= -3x²-4x²y - (-3x²+2x²y )
= -3x²-4x²y +3x²-2x²y
= -4x²y -2x²y
= -6 x²y
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