①×31
②
③139 ×+137 ×
④÷25
⑤×(150×36)×
⑥
0.25××0.4×8
①3××
②÷÷
③27÷×
④6×÷×6
⑤××
①
②36×()
③
④
⑤3.24×0.76+3.24×0.24