8(x+y)の3乗/2分の1(x+y)

8(x+y)の3乗/2分の1(x+y)

8(x+y)の3乗/2分の1(x+y)
=8(x+y)³÷(x+y)/2
=8(x+y)³*2/(x+y)
=16(x+y)²