乘法公式与因式分解1】998²-42】3(2x+1)(2x-1)-2(3x+2)(2-3x)

来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/25 00:03:47
乘法公式与因式分解1】998²-42】3(2x+1)(2x-1)-2(3x+2)(2-3x)乘法公式与因式分解1】998²-42】3(2x+1)(2x-1)-2(3x+2)(2-3

乘法公式与因式分解1】998²-42】3(2x+1)(2x-1)-2(3x+2)(2-3x)
乘法公式与因式分解
1】998²-4
2】3(2x+1)(2x-1)-2(3x+2)(2-3x)

乘法公式与因式分解1】998²-42】3(2x+1)(2x-1)-2(3x+2)(2-3x)
1】998²-4
=(998+2)(998-2)
=1000×996
=996000;
2】3(2x+1)(2x-1)-2(3x+2)(2-3x)
=3×(4x²-1)+2(9x²-4)
=12x²-3+18x²-8
=30x²-11;
如果本题有什么不明白可以追问,

1】998²-4
=(998+2)×(998-2)
=1000×996
=996000
2】3(2x+1)(2x-1)-2(3x+2)(2-3x)
=3(4x²-1)+2(3x+2)3x-2)
=12x²-3+18x²-8
=30x²-11

(998 2)x(998-2)=1000x996=996000
3(4x²-1)-2(4-9x²)=12x²-3-8 18x²=30x²-11

1 = (998+2)(998-2)=1000*996=996000
2 =3(4X^2-1)+2(9X^2-4)=12X^2-3+18X^2-8=30X^2-11