4.5+5=
0.36÷0.12=
0.03÷0.1=
1.25×0.8=
5.62-5.6=
0.2×0.3=
a-0.8a =
0.9x+0.1x=
55+36+64 75×55-75×45
417-(89+117) 125×25×32