①4+0.7x=102
②x﹣+6=16
③x:12.5=8:
④x﹣x=18
19+23=
5﹣1.6=
0.23÷0.1=
0.4×0.2=
=
÷0.25=
2.5+6=
0.12=
1-=
+=
1.5×20%=
307﹣299= += ×0.63= A﹣A=
5.2﹣0.6= ÷= ×= 4.25×4=