26×39分之14+13×39分之16
=39分之13×28+39分之13×16
=39分之13×(28+16)
=3分之1×44
=3分之44
2.8×(7分之1+28分之3)
=2.8×7分之1+2.8×28分之3
=0.4+0.3
=0.7
=26×14/39+13×14/39+13×2/39
=14/39×(26+13)+13×2/39
=14+26/39
=14+2/3=14又三分之二
26×14/39+13×16/39
=13×2×14/39+13×16/39
=13×(2×14/39+16/39)
=13×54/39
=18
26*14/39+13*16/39
=14*26/39+8*2*13/36
=14*26/39+8*26/39
=26/39*(14+8)
=26*39*22
=572/39
=44/3
2.8*(1/7+3/28
=28/10*1/7+28/10*3/28
=4/10+3/10
=7/10
13*(28/39+16/39)=44/3
2.8(1/7+3/28)=2.8(7/28)=70