1-=
, , ,
÷ = × ÷ × =
- = + - + =
÷0.4= + + = 1- + =
0.77+1.23= 20×70%= 70÷50%=
45÷90%= 200×(1﹣40%)= 15×60%=
2.4×5= 1.2÷0.6= 2.3+2= 82 =
125×0.8= 1- = 3.5-3= 43=