(3xy²)²+(－4xy³)·(－xy)怎样做.

(3xy²)²+(－4xy³)·(－xy)怎样做.
(3xy²)²+(－4xy³)·(－xy)怎样做.

(3xy²)²+(－4xy³)·(－xy)怎样做.
原式=9x²y四次+4x²y四次=13x²y四次
先去括号,(AB)²=A²B²,再相加即可

(3xy²)²+(－4xy³)·(－xy)
=(3xy²)²+4xy³·xy
=9x²y^4+4x²y^4
=13x²y^4

9x²y4+4x²y4=13x²y4

y4这是y的4次方