①156+28+72+44
②15.28﹣3.9﹣6.1
③12.5×8÷12.5×8
④÷[-(-)]
3.06-[1.8×(2.41-1.91)]
⑴ ⑵
×÷[(1-)÷] (+-)×24 ×101-
25×32×125
2.25×4.8+77.5×0.48