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=
6×= 2-=
3.8+0.75= +0.625= ﹣= 2÷0.04= 0.45×80=
87﹣49= 450÷0.9= 34÷7= 6.25×40= 4.3×=