51×16-6×51用简便的方法计算
(1)25×32, =25×4×8, =100×8, =800; (2)475+57+43, =475+(57+43), =475+100, =575; (3)25×(6×4), =(25×4)×6, =100×6, =600; (4)125×16, =125×8×2, =1000×2, =2000; (5)175+201, =175+200+1, =375+1, =376; (6)451-51-49, =451-(51+49), =451-100, =351.
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