计算(2m+3n)²(2m-3n)²4(a+2)²-7(a+3)(a-3)+3(a-1)²
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计算(2m+3n)²(2m-3n)²4(a+2)²-7(a+3)(a-3)+3(a-1)²
计算
(2m+3n)²(2m-3n)²
4(a+2)²-7(a+3)(a-3)+3(a-1)²
计算(2m+3n)²(2m-3n)²4(a+2)²-7(a+3)(a-3)+3(a-1)²
第一个,拆成4个括号,(2m+3n)(2m+3n)(2m-3n)(2m-3n),你给换一下.
(2m+3n)(2m-3n)(2m+3n)(2m-3n)=(4m²-9n²)(4m²-9n²)=(4m²-9n²)²相信后面你自己会解答了.
(4m²-9n²)²=14m四次方+91n四次方-72m²n²
4(a+2)^2-7(a+3)(a-3)+3(a-1)^2
=4(a^2+4a+4)-7(a^2-9)+3(a^2-2a+1)
=4a^2+16a+16-7a^2+63+3a^2-6a+3
=10a+82
[(2m+3n)(2m-3n)]²=(4m²-9n²)²=16m^4-72m²n²+81n^4
4(a²+4a+4)-7(a²-9)+3(a²-2a+1)
=10a+82
第一个,拆成4个括号,(2m+3n)(2m+3n)(2m-3n)(2m-3n),你给换一下。
(2m+3n)(2m-3n)(2m+3n)(2m-3n)=(4m²-9n²)(4m²-9n²)=(4m²-9n²)²相信后面你自己会解答了。