计算:1. 3x(x^2+4x+4)-(x-3)(3x+4) 5
计算:1.3x(x^2+4x+4)-(x-3)(3x+4)2.(2x^2x+3)(-x^3+x-1)3.(3m+1)(2m-3)-(6m-5)(m-4)4.(a+2)(a...
计算:1. 3x(x^2+4x+4)-(x-3)(3x+4)
2. (2x^2x+3)(-x^3+x-1)
3. (3m+1)(2m-3)-(6m-5)(m-4)
4. (a+2)(a-2)-a(a-1)
5. (a+b)^2+(a-b)(2a+b)-3a^2 展开
2. (2x^2x+3)(-x^3+x-1)
3. (3m+1)(2m-3)-(6m-5)(m-4)
4. (a+2)(a-2)-a(a-1)
5. (a+b)^2+(a-b)(2a+b)-3a^2 展开
1个回答
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1. 3x(x^2+4x+4)-(x-3)(3x+4)
=3x³+12x²+12x-3x²-4x+9x+12
=3x³+9x²17x+12
2、(2x^2x+3)什么意思?
3. (3m+1)(2m-3)-(6m-5)(m-4)
=6m²-9m+2m-3-(6m²-24m-5m+20)
=6m²-9m+2m-3-6m²+24m+5m-20)
=20m-23
4. (a+2)(a-2)-a(a-1)
=a²-4-a²+a
=a-4
5. (a+b)^2+(a-b)(2a+b)-3a^2
=a²+2ab+b²+2a²+ab-2ab-b²-3a²
=ab
=3x³+12x²+12x-3x²-4x+9x+12
=3x³+9x²17x+12
2、(2x^2x+3)什么意思?
3. (3m+1)(2m-3)-(6m-5)(m-4)
=6m²-9m+2m-3-(6m²-24m-5m+20)
=6m²-9m+2m-3-6m²+24m+5m-20)
=20m-23
4. (a+2)(a-2)-a(a-1)
=a²-4-a²+a
=a-4
5. (a+b)^2+(a-b)(2a+b)-3a^2
=a²+2ab+b²+2a²+ab-2ab-b²-3a²
=ab
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