○□○=○( )
36+5= 72-7= 78+6= 46+6-30=
82+9= 4×2= 26+40= 47+20-8=
3×2= 93-13= 68+9= 38+4+7 =
36+8= 70+30= 2×2= 67-40+21 =
×=( )
30-57 24÷65 4×65×5
4+14÷1 35+447-7 24÷42×3
①15.28﹣3.6﹣3.4
②()×7.2
③
④7.5÷[(6.8﹣4.3)×0.12]