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| (1)(4+10)×25 =4×25+10×25 =100+250 =350; (2)36×57+64×57 =(36+64)×57 =100×57 =5700; (3)17×39+17×31 =17×(39+31) =17×70 =1190; (4)34×301 =34×300+34×1 =10200+34 =10234. |
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a.12×(4+25)[ ]
a. 47+(14×5)(1)35+65=
65+35=
35+65○65+35