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| (1)165+299 =165+300-1 =465-1 =464; (2)47×9+47 =47×(9+1) =47×10 =470; (3)630÷18÷5 =630÷(18×5) =630÷90 =4; (4)36×25 =(4×9)×25 =(4×25)×9 =100×9 =900; (5)63×73-63×63 =63×(73-63) =63×10 =630; (6)421-175-25 =421-(175+25) =421-200 =221; (7)125×25×64 =125×25×(8×8) =(125×8)×(25×8) =1000×200 =200000; (8)72×26+36×48 =(36×2)×26+36×48 =36×52+36×48 =36×(52+48) =36×100 =3600. |
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a.12×(4+25)[ ]
a. 47+(14×5)(1)35+65=
65+35=
35+65○65+35