(1)(4x-3y)^2 (2)(1.5a-2/3b)^2 (3)(25x^3+15^2-20x)÷(-5x) (4)(
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(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,
(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,
(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
(4)(2/5y^3-7y^2+2/3y)÷2/3y
=2/5y^3÷2/3y-7y^2÷2/3y+2/3y ÷2/3y
=3y²/5-21y/2+1
(5)(8a^3b-5a^2b^2)÷4ab
=8a^3b÷4ab -5a^2b^2 ÷4ab
=2a²-5ab/4
(6)(2a)^3×b^4÷12a^3b^2
=8a³b^4÷12a³b²
=2b²/3
(7)(6/5a^3x^4-0.9ax^3)÷3/5ax^3
=6/5a^3x^4÷3/5ax^3-0.9ax^3 ÷3/5ax^3
=2a²x-1.5
(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
(4)(2/5y^3-7y^2+2/3y)÷2/3y
=2/5y^3÷2/3y-7y^2÷2/3y+2/3y ÷2/3y
=3y²/5-21y/2+1
(5)(8a^3b-5a^2b^2)÷4ab
=8a^3b÷4ab -5a^2b^2 ÷4ab
=2a²-5ab/4
(6)(2a)^3×b^4÷12a^3b^2
=8a³b^4÷12a³b²
=2b²/3
(7)(6/5a^3x^4-0.9ax^3)÷3/5ax^3
=6/5a^3x^4÷3/5ax^3-0.9ax^3 ÷3/5ax^3
=2a²x-1.5
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