0.13=
+ = 1- = + = - =
×0= ×9= × = × =
①-+- ②-(-) ③×35+35×
8.4÷0.6= 3.6×4÷3.6÷4= 0.32= 0.6b+0.4b=
7.14÷0.7= x+5.2x= 5.4×101-5.4= y-0.4y-0.3y=
×2= 2- = × = 0× = + + =
28× = - = 1- - = 69× = 7- =
×= 0.54÷6= ÷= 2.6×0.3= 27.8﹣1.9=