0.5+4.5x=45.5
0.8+1.7-x=1.73
2(x-3)=11.6
3.5×0.2=
10÷0.5=
6×0.25=
0.63÷+0.9=
0.99÷0.01=
1.2×4=
3.9×0.01=
10a+3a=
=5÷= =。
+= ×= -= ÷=
0.18×= 4.7+0.38= 3.2÷0.1= (10﹣)×0=