1.16a^2-1/49b^2 2.3x^3-12x 3.1-0.04x^4y^2 4.(3m+2n)^2-(2m-3n
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1.16a^2-1/49b^2 2.3x^3-12x 3.1-0.04x^4y^2 4.(3m+2n)^2-(2m-3n)^2 5.(a^2-b^2)+(3a-3b)
6.758^2-258^2 注用因式分解计算^后面是平方
6.758^2-258^2 注用因式分解计算^后面是平方
1:16a^2-1/49b^2
=(4a+1/7b)(4a-1/7b)
2:3x^3-12x
=3x(x^2-4)
=3x(x+2)(x-2)
3:1-0.04x^4y^2
=(1+0.2x^2y)(1-0.2x^2y)
4:(3m+2n)^2-(2m-3n)^2
=(3m+2n-2m+3n)(3m+2n+2m-3n)
=(m+5n)(5m-n)
5:(a^2-b^2)+(3a-3b)
=(a+b)(a-b)+3(a-b)
=(a+b+3)(a-b)
6:758^2-258^2
=(758-258)(758+258)
=500*1016
=508000
=(4a+1/7b)(4a-1/7b)
2:3x^3-12x
=3x(x^2-4)
=3x(x+2)(x-2)
3:1-0.04x^4y^2
=(1+0.2x^2y)(1-0.2x^2y)
4:(3m+2n)^2-(2m-3n)^2
=(3m+2n-2m+3n)(3m+2n+2m-3n)
=(m+5n)(5m-n)
5:(a^2-b^2)+(3a-3b)
=(a+b)(a-b)+3(a-b)
=(a+b+3)(a-b)
6:758^2-258^2
=(758-258)(758+258)
=500*1016
=508000
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