[2/3x+3/4y] [2/3x+4/3y]
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so, (23x+34y)×(23x+43y)
=49x2+89xy+612yx+1212y2
=49x2+89xy+12xy+y2
=49x2+16+918xy+y2
=49x2+2518xy+y2
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