÷2 ÷1
÷ ÷5 ×
0.6767% 31.3313%
260%2.6 100%
( )×0= 4- = ÷ = × =
( - )÷ = ×0+20%= + = 50%× =
① ② ③
① x+ x= ②x÷ + = ③75%x-25%x=200