简算.
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| (1)27.4+0.8+2.6+9.2 =(27.4+2.6)+(0.8+9.2) =30+10 =40; (2)101×78 =(100+1)×78 =100×78+1×78 =7800+78 =7878; (3)4500÷4÷25 =4500÷(4×25) =4500÷100 =45; (4)19.53-8.37-1.63 =19.53-(8.37+1.63) =19.53-10 =9.53; (5)15.64+18.2-5.64 =15.64-5.64+18.2 =10+18.2 =28.2; (6)19×44+19×56 =19×(44+56) =19×100 =1900. |
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a.12×(4+25)[ ]
a. 47+(14×5)(1)35+65=
65+35=
35+65○65+35