55*99简便运算怎么做?

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55*99简便运算怎么做?55*99简便运算怎么做?55*99简便运算怎么做?55×99=55×(100-1)=55×100-55×1=5500-55=544555*100-55=5500-55=54

55*99简便运算怎么做?
55*99简便运算怎么做?

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