①4×(250-400÷16)
②5.5÷×
③3.6×+6.4×
④7-7×+
⑤+4.9++5.1
⑥(-0.8+)×12.5
×4.2= 10.4﹣0.8= 44÷ = 0.11÷0.1=
÷ = 8.7÷29= × = 6×( ﹣ )=
①4.7﹣0.7×1.5﹣0.75
② ÷[( + )× ]
③25×4.9×4
④35×25×( )
⑤5600÷(7×25)
⑥13×(10+0.2)
1+0.09= 12.5×0.8= 80﹣80%= 0.43=
= 505÷10.1= = 48÷32=