x÷5/7=3/10 x-1/5x=10 5/8x+1/4=1
x=3/14 x=25/2 x=6/5
5/7+5/17+2/7 5/9×4+5/9÷5
=(5/7+2/7)+5/17 =5/9×(4+1/5)
=1+5/17 =5/9×21/5
=22/17 =21/9
3/4÷(1/2-2/5) 5÷[(2/3+7/5)×1/13]
=3/4÷1/10 =5÷(31/15×1/13)
=15/2 =5÷31/195
=975/31