9.9²×9.9×0.2+0.01因式分解

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9.9²×9.9×0.2+0.01因式分解9.9²×9.9×0.2+0.01因式分解9.9²×9.9×0.2+0.01因式分解题目错了第一个乘号应该是加号吧9.9&sup

9.9²×9.9×0.2+0.01因式分解
9.9²×9.9×0.2+0.01因式分解

9.9²×9.9×0.2+0.01因式分解
题目错了
第一个乘号应该是加号吧
9.9²+9.9×0.2+0.01
=9.9²+2×9.9×0.1+0.1²
=(9.9+0.1)²
=10²
=100

9.9²×9.9×0.2+0.01
=9.9²×9.9×0.2+0.1²
=(9.9+0.1)²
=10²
=100

9.9²×9.9×(0.2+0.01)=9.9×9.9×9.9×0.21