(1)(4x-3y)^2 (2)(1.5a-2/3b)^2 (3)(25x^3+15^2-20x)÷(-5x) (4)(2/5y^3-7y^2+2/3y)÷2/3y

题目

(1)(4x-3y)^2 (2)(1.5a-2/3b)^2 (3)(25x^3+15^2-20x)÷(-5x) (4)(2/5y^3-7y^2+2/3y)÷2/3y
(5)(8a^3b-5a^2b^2)÷4ab (6)(2a)^3×b^4÷12a^3b^2 (7)(6/5a^3x^4-0.9ax^3)÷3/5ax^3
越快越好,

答案

(1)(4x-3y)^2 =(4x)²-2×4x×3y+(3y)²=16x²-24xy+9y² (2)(1.5a-2/3b)^2=2.25a²-2ab+4b²/9 (3)(25x^3+15x^2-20x)÷(-5x) =25x^3÷(-5x) +15x^2÷(-5x) -20x ÷(-5x) =-5x²-3x+4 ...