简便计算49*(2/7+1/5)*25

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简便计算49*(2/7+1/5)*25
简便计算49*(2/7+1/5)*25

简便计算49*(2/7+1/5)*25
简便计算:
49*(2/7+1/5)*25
=49*25*2/7+49*25/5
=350+245
=595

49*(2/7+1/5)*25
=49*25*(2/7+1/5)
=49*25*2/7+49*25*1/5
=7*25*2+49*5
=595

49=7*7
25=5*5
为5*7*5*7*(2/7+1/5)=5*7*(2*5+1*7)=5*7*17=595

49*(2/7+1/5)*25
=7*(2 +7/5)*25
=7*(10 +7)*5
=35*17
=30*17+5*17
=510+85
=595