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| (1)125×(7×8), =125×8×7, =1000×7, =7000; (2)25×(7+4), =25×7+25×4, =175+100, =275; (3)50×25×4×20, =(50×20)×(25×4), =1000×100, =100000; (4)85×67, =(80+5)×67, =80×67+5×67, =5360+335, =5695; (5)58×41-58, =58×41-58×1, =58×(41-1), =58×40, =2320. |
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