(1). (0.2x-0.1)(0.1+0.2x) (2). 102×98 运用平方差公式计算
问题描述:
(1). (0.2x-0.1)(0.1+0.2x) (2). 102×98 运用平方差公式计算
求解答要有过程
答
(1).(0.2x-0.1)(0.1+0.2x)
=(0.2x-0.1)(0.2x+0.1)
=(0.2x)²-0.1²
=0.04x²-0.01
(2)102×98
=(100+2)(100-2)
=100²-2²
=10000-4
=9996
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