计算:4(x+1)^2-(2x+5)(2x-5)
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计算:4(x+1)^2-(2x+5)(2x-5)计算:4(x+1)^2-(2x+5)(2x-5)计算:4(x+1)^2-(2x+5)(2x-5)4(x+1)^2-(2x+5)(2x-5)=4(x^2+
计算:4(x+1)^2-(2x+5)(2x-5)
计算:4(x+1)^2-(2x+5)(2x-5)
计算:4(x+1)^2-(2x+5)(2x-5)
4(x+1)^2-(2x+5)(2x-5)
=4(x^2+2x+1)-(4x^2-25)
=4x^2+8x+4-4x^2+25
=8x+29
4(x+1)^2-(2x+5)(2x-5)
=4x^2+8x+4-4x^2+25
=8x+29
前面用完全平方公式
后面用平方差公式
4(x+1)^2-(2x+5)(2x-5)=4(x+1)^2-(4x^2-25)=4x^2+8x+4-4x^2+25=8x+29
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