①74×78+26×78
②101×99
③43.51+20.4+56.49+9.6
5.26+7+1.74 27.85-(7.85+3.9)
5.6+2.7-3.6 10-2.75-3.25
15.25-3.1+0.65-4.9
4.6+12.3+5.8 15-(1.2+3.9) 4.6-1.75+2.08 4.28+0.53-3.37
27.3+73.2+72.7 43.25- 10.4-3.25
5.85-(1.89+1.85) 14.37-(7.42-4.37)
64.3-18.75+15.7-11.25
8.37-2.17+0.83
=8.37-(2.17+0.83)
=8.37-3
=5.37( )
改正:
①3.6﹣2.8+7.4﹣7.2
②1.25×1.6×25
③÷4
④÷[(﹣)×]