Question

(三分之一a方b)方乘以(-9ab的三次方)除以(-2a的4次方b方)=?

Answer 1

[(1/3)a²b]²×(-9ab^3)÷(-2a^4 b²)
=1/9 a^4 b²×9ab^3)÷2a^4 b²
=ab^3/2

追问

x(2x+1)（1-2x)-4x(x-1)方=？

追答

x(2x+1)（1-2x)-4x(x-1)²=x[(1+2x)(1-2x)-4(x-1²)]
=x[(1-4x²)-(4x²-8x+4)]
=x(1-8x²+8x-4)
=x(-8x²+8x-3)
=-x(8x²-8x+3)