75%:0.8=x: x+0.6=12.6 ×(x-4)=8.4
176+98=
2-=
0.24÷10%=
0.7÷2.5÷4=
-=
÷3=
4×25%=
(+)×6=
①17.8×31.2÷5.2
②1.6-1.2+37.8
③47.9--
④68×99
0.5×1.2=2×0.3