B=(2x²+3x)÷(5x)
=2x²÷(5x)+3x÷(5x)
=(2÷5)×(x²÷x)+(3÷5)×(x÷x)
=0.4x+0.6
B-A=(0.4x+0.6)-5x
=0.4x+0.6-5x
=(0.4x-5x)+0.6
=-4.6x+0.6
B=(2x²+3x)÷(5x)
=2x²÷(5x)+3x÷(5x)
=(2÷5)×(x²÷x)+(3÷5)×(x÷x)
=0.4x+0.6
B-A=(0.4x+0.6)-5x
=0.4x+0.6-5x
=(0.4x-5x)+0.6
=-4.6x+0.6