①400﹣288÷24×5
②10.28+8.14﹣5.28+1.86
③
④
4.2﹣1.38+5.8﹣3.62
×16.31﹣2.31÷
(+)×4+
÷[(+)×]
① ②
③ ④
①7.63﹣0.54﹣(2.46﹣1.37)
②2.1×40%+ ×2.1
③ ÷[( + )× ]
①3.86+19.7+6.14
② + ÷
③28.26÷3.14×1.2
④ × ﹣ ÷
①36×()
②1.3×37.5%+2.7×
③ [()]
④13÷()×
①7.4﹣6.62+20.6﹣13.38
②×+×
③(-+)÷
④2×0.8×12.5×50%
⑤÷(÷+)
⑥×[1÷(+)]
①21×16÷14+76
②9- -
③ ×0.8×12.5
④48×( + - )
⑤7.6×9.4- +7.6×1.6
⑥ ×[ ÷(0.4- )]
①2.75×6.2+27.5×0.38
②0.125×32×2.5
③15.72-2.17-1.83+4.28
⑤
⑥