1.9.8-6X=5又4/5
4.8-0.8=6X
X=4/6=2/3
2.3/5:36%=4/5/X
3/5*100/36=4/5X
5/3=4/5X
12=25X
X=12/25　　4.6与2/5的差，除以它们的和，再乘1/5，积是多少(4.6-2/5)/(4.6+2/5)*1/5=(4.6-0.4)/(4.6+0.4)/5=4.2/5/5=4.2/25=0.168