5/8+(3/4-1/6)
=15/24+(18/24-4/24)
=15/24+14/24
=29/24
3-1/4-1/3-3/4
=3-(1/4+3/4)-1/3
=3-1-1/3
=2-1/3
=1又3分之1
7.8X1.17-7.8X0.17
=7.8X(1.17-0.17)
=7.8X1
=7.8
5/8+4/5-(3/8-1/5)
=5/8-3/8+(4/5+1/5)
=1/4+1
=1.25
0.25+11/15+3/4+4/15
=(0.25+0.75)+(11/15+4/15)
=1+1
2