743-98 怎样简便运算
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743-98怎样简便运算743-98怎样简便运算743-98怎样简便运算743-98=743-100+2=643+2=645=743-(100-2)=743-100+2=643+2=645743-98
743-98 怎样简便运算
743-98 怎样简便运算
743-98 怎样简便运算
743-98
=743-100+2
=643+2
=645
=743-(100-2)
=743-100+2
=643+2
=645
743-98
=743-(100-2)
=743-100+2
=643+2
=645