用乘法公式计算（1）${678}^{2}+2\times 678\times 322+{322}^{2}$（2）$65412{3}^{2}-654124\times 654122$

用乘法公式计算（1）${678}^{2}+2\times 678\times 322+{322}^{2}$（2）$65412{3}^{2}-654124\times 654122$

（1）原式$=\left ( {678+322} \right )^{2}$

$={1000}^{2}$

$=1000000$

（2）原式$={654123}^{2}-\left ( {654123+1} \right )\left ( {654123-1} \right )$

$={654123}^{2}-\left ( {{654123}^{2}-1} \right )$

$={654123}^{2}-{654123}^{2}+1$

$=1$