(1)X和0.625的比等于七分之八和四的比。 X :0.625 = 8/7 :40.625×8/7÷4 = 5/28X = 5/28(2)X和72的比等于3和8的比。X :72 = 3 : 872×3÷8 = 27X = 27
1.x:0.625=8/7:44x=0.625*8/7x=5/8*8/7/4=5/282.x:72=3:88x=72*3x=273.13/6:1.3=13/4:x13/6x=13/4*1.3x=2.6/3