①[3-( +0.75)+ ]÷
② -( - )
③13×( + )×17
④0.76× -7.6×0.28+76×7%
⑤(1+ + )×( + + )-(1+ + + )×( + )
①(2.3+2.3+2.3+2.3)×2.5
②7.2×85%+2.8×0.85
③( + - )×24
④ ÷[ ×( - )]
⑤[( -0.25)× +0.3]÷
①4080÷12﹣24×1.5
② ﹣ + ﹣
③48×75%+53× ﹣0.75
④8×( + )+
⑤ ÷[ ×( ﹣ )]
⑥ + + + +