①7840万0.78亿 ②123-68+☆ 123- (68+☆) (☆>0)
③360个0.013个1和60个0.1 ④125×25×4×8125×8+25×4
0.32+10=
3.4-0.9=
4.37×10=
700+(175×2)=
10-2.18=
6-0÷6=
3.45+2.65=
2×9+2×9=