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| (1)256×7-56×7, =(256-56)×7, =200×7, =1400; (2)125×(8+4), =125×8+125×4, =1000+500, =1500; (3)22×35, =(20+2)×35, =20×35+2×35, =700+70, =770; (4)99×99+99, =99×(99+1), =99×100, =9900. |
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a.12×(4+25)[ ]
a. 47+(14×5)(1)35+65=
65+35=
35+65○65+35