2.7^2*1.8^2-1.2*1.2^2 因式分解

2.7^2*1.8^2-1.2*1.2^2 因式分解
2.7^2*1.8^2-1.2*1.2^2
因式分解

2.7^2*1.8^2-1.2*1.2^2 因式分解
2.7²×1.8²-1.2×1.2²
=（9×0.3）²×（9×0.2）²-30×0.2²×（4×0.3）²
=9²×9²×0.3²×0.2²-30×4²×0.3²×0.2²
=（9²×9²-30×4²）×0.3²×0.2²
=6081×0.09×0.04
=21.8916