运用完全平方公式进行简便运算,) (0.99)²(0.99)² 81² 302² (-99 1/2)²
问题描述:
运用完全平方公式进行简便运算,) (0.99)²
(0.99)² 81² 302² (-99 1/2)²
答
解: (0.99)²
=(1-0.01)²
=1-0.02+0.0001
=0.9801
81²
=(80+1)²
=6400+160+1
=6561
302²
=(300+2)²
=90000+1200+4
=91204
(-99 1/2)²
=(99 1/2)²
=(100-1/2)²
=10000-100+1/4
=9900+1/4
=9900.25
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答
解: (0.99)² =(1-0.01)² =1-0.02+0.0001 =0.9801 81² =(80+1)²=6400+160+1 =6561302²=(300+2)²=90000+1200+4=91204(-99 1/2)²=(99 1/2)²=(100-1/2)²=10000...