2022年中考数学专题：完全平方和平方差公式

${(-3a^2)}^3=-9a^6$

${(-a)}^2\cdot a^3=a^5$

${(2x-y)}^2=4x^2-y^2$

$a^2+4a^2=5a^4$

$x^2+x^3=x^5$

${(x-y)}^2=x^2-y^2$

${\left(x^2\right)}^3=x^6$

$x^6÷x^3=x^2$

$3\mathit{mn}-2\mathit{mn}=1$

${\left(m^2{n}^3\right)}^2=m^4{n}^6$

${(-m)}^3\cdot m=m^4$

${(m+n)}^2=m^2+n^2$

24

48

12

$2\sqrt{6}$

$|-3|+\tan 45°=-2$

${\left(\mathit{xy}\right)}^5÷{\left(\frac{x}{y}\right)}^5=x^{10}$

${(a-b)}^2=a^2+2\mathit{ab}+b^2$

$x^{3}y-x{y}^3=\mathit{xy}(x+y)(x-y)$

$a-(b+c)=a-b+c$

$a^2+a^2=2a^2$

${(x+1)}^2=x^2+1$

$2a^2\cdot {(-2a{b}^2)}^2=-16a^4{b}^4$

$a^3\cdot a^3=2a^3$

${(-2a)}^2=4a^2$

${(a+b)}^2=a^2+b^2$

$(a+2)(a-2)=a^2-2$

$\sqrt{2}+\sqrt{3}=\sqrt{5}$

$a^3\cdot a^2={\alpha }^6$

${\left(a^3\right)}^2=a^6$

$a^2-b^2={(a-b)}^2$

$a^3+a^2=a^5$

$a^3÷a^2=a$

$3a^3\cdot 2a^2=6a^6$

${(a-2)}^2=a^2-4$

$2a-a=2$

${(a-1)}^2=a^2-1$

$a^6÷a^3=a^2$

${\left(2a^3\right)}^2=4a^6$