70×(1+ )56
①×(1-)
②7×+
③19×
④(+)×2.8
⑤1-÷
⑥×÷
×8-
①÷×
②×3.2+6.8÷
③105×(+)
④﹣+﹣
⑤6.4÷[(3﹣1.4)×]
①36÷[24-(60-39)]
②3.6÷18+21
③ ÷ ×
④3.78-0.83-0.17
⑤5× + ×5
⑥36×( + )
①2.8× ÷
②( + )×30
③7.42-5.87+2.58-4.13
④0.25×4.4
⑤25×32×125
⑥ ×[ -( -0.125)]