①3.16+2.25+7.75
②5×32×125
③34×99+34
④56×8÷56×8
⑤12.39-(8.39+0.56)
⑥2600÷5÷20
0.9= 0.30000= 7=
10.02= 10.0500= 2.2=
①558﹣(135+258)
②49×102﹣2×49
③317+(128﹣119)×240
④67×101
⑤4100÷(41×5)
⑥540÷[(263+37)÷50]
①x:3=:
②=
③:=:x
④:x=3:12
⑤:x=5%:0.6
⑥=