3/8乘以8/3等于5/4乘以4/5等于0.35乘以20/7等于一。(3/8)x =1 x =3/8 (5/4)x =1 x=4/50.35x =1 x =1÷0.35=20/7
等于1,等于这个数乘以这个数的倒数3/8*8/3=5/4*4/5=0.35*20/7=1(0.35=35/100=7/20)