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| (1)7100-137-263+300 =7100-(137+263)+300 =7100-400+300 =7000; (2)438+126+162+74 =(438+162)+(126+74) =600+200 =800; (3)6×(8×7)×125 =6×7×(8×125) =42×1000 =42000; (4)25×18×4×2 =(25×4)×(18×2) =100×36 =3600. |
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a.12×(4+25)[ ]
a. 47+(14×5)(1)35+65=
65+35=
35+65○65+35