数学题求解······ 好了,加分······· 每一步写清楚1.(3x+9)(6x+8)2.(1\2x²y-2xy+y²)* 3xy3.(1 \3a²b³)*(-15a²b²)4.(3mn+1)(3mn-1)-8m²n²5.(x+2)² - (x+1)(x-1
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![数学题求解······ 好了,加分······· 每一步写清楚1.(3x+9)(6x+8)2.(1\2x²y-2xy+y²)* 3xy3.(1 \3a²b³)*(-15a²b²)4.(3mn+1)(3mn-1)-8m²n²5.(x+2)² - (x+1)(x-1](/uploads/image/z/11672880-24-0.jpg?t=%E6%95%B0%E5%AD%A6%E9%A2%98%E6%B1%82%E8%A7%A3%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7+%E5%A5%BD%E4%BA%86%2C%E5%8A%A0%E5%88%86%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7+%E6%AF%8F%E4%B8%80%E6%AD%A5%E5%86%99%E6%B8%85%E6%A5%9A1.%EF%BC%883x%2B9%29%286x%2B8%292.%281%5C2x%26%23178%3By-2xy%2By%26%23178%3B%EF%BC%89%2A+3xy3.%EF%BC%881+%5C3a%26%23178%3Bb%26%23179%3B%EF%BC%89%2A%EF%BC%88-15a%26%23178%3Bb%26%23178%3B%EF%BC%894.%EF%BC%883mn%2B1%EF%BC%89%EF%BC%883mn-1%EF%BC%89-8m%26%23178%3Bn%26%23178%3B5.%EF%BC%88x%2B2%EF%BC%89%26%23178%3B+-+%EF%BC%88x%2B1%EF%BC%89%EF%BC%88x-1)
数学题求解······ 好了,加分······· 每一步写清楚1.(3x+9)(6x+8)2.(1\2x²y-2xy+y²)* 3xy3.(1 \3a²b³)*(-15a²b²)4.(3mn+1)(3mn-1)-8m²n²5.(x+2)² - (x+1)(x-1
数学题求解······ 好了,加分······· 每一步写清楚
1.(3x+9)(6x+8)
2.(1\2x²y-2xy+y²)* 3xy
3.(1 \3a²b³)*(-15a²b²)
4.(3mn+1)(3mn-1)-8m²n²
5.(x+2)² - (x+1)(x-1)
6.(-2m-1)(3m-2)
每一步写清楚
数学题求解······ 好了,加分······· 每一步写清楚1.(3x+9)(6x+8)2.(1\2x²y-2xy+y²)* 3xy3.(1 \3a²b³)*(-15a²b²)4.(3mn+1)(3mn-1)-8m²n²5.(x+2)² - (x+1)(x-1
1.(3x+9)(6x+8)
=18x²+54x+24x+72
=18x²+78x+72
2.(1\2x²y-2xy+y²)* 3xy
=3/2x³y²-6x²y²+3xy³
3.(1 \3a²b³)*(-15a²b²)
=-5a^4*b^5
4.(3mn+1)(3mn-1)-8m²n²
=9m²n²-1-8m²n²
=m²n²-1
=(mn+1)(mn-1)
5.(x+2)² - (x+1)(x-1)
=x²+4x+4-x²+1
=4x+5
6.(-2m-1)(3m-2)
=-6m²+4m-3m+2
=-6m²+m+2