55*99简便运算怎么做?
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55*99简便运算怎么做?
55×99
=55×(100-1)
=55×100-55×1
=5500-55
=5445
55*100-55=5500-55=5445
55×99
=55×(100-1)
=55×100-55×1
=5500-55
=5445
55*99简便运算怎么做?55×99
=55×(100-1)
=55×100-55×1
=5500-55
=5445