+9=12 9+=16
+9=15 +9= 13
+9=17 9+=14
60+360+30 34+534-5 26+733+5
48+948-9 65-856-8 18+516+7
①7.3-2.05+0.82
②3×÷3×
③3.68×6.7+ 63.2×0.67
24.06+0.4= += 5﹣+= 2.5×44=
15÷1%= 2.4×= 4×÷4×= 30÷62.5%=