102×98 = = = = = = = = 简便运算!
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102×98========简便运算!102×98========简便运算!102×98========简便运算!102×98=(100+2)×98=100×98+2×98=9800+196=9996
102×98 = = = = = = = = 简便运算!
102×98 = = = = = = = = 简便运算!
102×98 = = = = = = = = 简便运算!
102×98
=(100+2)×98
=100×98+2×98
=9800+196
=9996
(100+2)*(100-2) = 100^2-2^2 = 10000-4 = 9996
102×98 =（100+2）*（100-2）=100*100-2*2=10000-4=9996