①4000÷25+15×24
②3÷ - ÷3
③[1+( - )]×
④( + - )÷
⑤19.43﹣(9.43+6.89)
⑥( + )×4+
①101×9.9
②44﹣72÷
③36×()
④÷[(﹣)×3]
⑤95×3.8+6.2÷
⑥0.25×40÷0.25×40
①x:3=:
②=
③:=:x
④:x=3:12
⑤:x=5%:0.6
⑥=
①-+-
②×+÷
③(6﹣1.3×4)÷0.1
④0.4×0.25×8×125
⑤3.4÷[(1.25+0.45)×23]
①5.8﹣1.9﹣2.1
②×2.5××4
③÷(﹣)×
④83×0.75+17÷