①1.46+3.8+0.54+6.2
②15×[102÷(52-35)]
③25×23×4
④386-78-22
⑤25×73+25×27
17.49+6.3= 20.6-16.8=
①67.73+39.67= ②★59-28.19=
43.58+12.36=
②21.65﹣8.9=
③20﹣3.98=
7元零8分﹣3元9角
3km50m+750m
10kg﹣2kg650g