①2x﹣4×0.5=4
②:=x:
0×5.16= 9.8+2.6= 502-399=
÷4= × = 20×5=
①x: =36:
②70%x﹣18× =9
50+950= 300﹣201= 45×8= 105÷3=
1﹣= ﹣= 15÷= ×=
12.12﹣12= 2.5×6= 100÷50%= 0.3×0.6=