简便运算 1.49.5*10又3/5-(50-1/2)*3/5 2.(1/15+2/17)*15*17

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简便运算 1.49.5*10又3/5-(50-1/2)*3/5 2.(1/15+2/17)*15*17

简便运算 1.49.5*10又3/5-(50-1/2)*3/5 2.(1/15+2/17)*15*17
简便运算 1.49.5*10又3/5-(50-1/2)*3/5 2.(1/15+2/17)*15*17

简便运算 1.49.5*10又3/5-(50-1/2)*3/5 2.(1/15+2/17)*15*17
1. 49.5*10又3/5-(50-1/2)*3/5
=49.5*(10+3/5)-49.5-3/5
=49.5*(10+3/5-3/5)
=49.5*10
=495
2. (1/15+2/17)*15*17
=1/15*15*17+2/17*15*17
=17+30
=47

1. 49.5*10又3/5-(50-1/2)*3/5
=49.5*(10+3/5)-49.5*3/5
=49.5*10+49.5*3/5-49.5*3/5
=495
2. (1/15+2/17)*15*17
=1/15*15*17+2/17*15*17
=17+2*15
=47