7/10*48+48*3/10
=(7/10+3/10)*48
=1*48
=48
24*(5/12-1/24)
=24*5/12-24*1/24
=10-1
=9
4.7*1/3+1.3*1/3
=1/3*(4.7+1.3)
=1/3*6
=2
(20+4/5)÷4/5
=20*5/4+4/5*5/4
=25+1
=26
(1/8*1/3)*3*8
=1/8*1/3*3*8
=1/8*8*1/3*3
=1*1
=1
12*(1/4+1/6-1/3)
=12*1/4+12*1/6-12*1/3
=3+2-4
=1