①0.75+ + +0.375
② +9 +99 +999 +9999
③4 -(2 + )
④
⑤48.3-15 -4
⑥9 ×4.25+4 ÷6
①-÷-
②×+÷8
③(×27-)×
④÷[(+)×]
①-+-
②×+÷
③(6﹣1.3×4)÷0.1
④0.4×0.25×8×125
⑤3.4÷[(1.25+0.45)×23]
①
②
③
①÷×
②×3.2+6.8÷
③105×(+)
④﹣+﹣
⑤6.4÷[(3﹣1.4)×]
①21×16÷14+76
②9- -
③ ×0.8×12.5
④48×( + - )
⑤7.6×9.4- +7.6×1.6
⑥ ×[ ÷(0.4- )]