12÷13=
82=
0.23=
15.3÷0.3=
1.2+0.8÷0.4=
56×1.25
21.36÷0.8﹣12.9
12.4÷(5.6﹣2.5)
5x+7.4=31.8
3(x+4.3)=18.9