1、(91/13)*(48/16)*(75/25)=7*3*3=63
2、(3+1)/3+(16+1)/8+(45+1)/15+(96+1)/24+(175+1)/35+(288+1)/48=1+1/3+2+1/8+3+1/15+4+1/24+5+1/35+6+1/48
=21+(1/3+1/15+1/35)+(1/8+1/24+1/48)
=21+3/7+3/16
=21+69/112
3、1.7(5.68+4.02+0.3)=17
1、(91/13)*(48/16)*(75/25)=7*3*3=63
2、(3+1)/3+(16+1)/8+(45+1)/15+(96+1)/24+(175+1)/35+(288+1)/48=1+1/3+2+1/8+3+1/15+4+1/24+5+1/35+6+1/48
=21+(1/3+1/15+1/35)+(1/8+1/24+1/48)
=21+3/7+3/16
=21+69/112
3、1.7(5.68+4.02+0.3)=17