脱式计算(后两题用简便方法算).24×[(725-230)÷5] 72÷36×(82+28) 25×64×125 102×73-2×73.
(1)24×[(725-230)÷5] =24×[495÷5], =24×99, =24×(100-1), =24×100-24, =2400-24, =2376. (2)72÷36×(82+28) =2×110, =220; (3)25×64×125 =25×4×2×8×125; =(25×4)×2×(8×125), =100×2×1000, =200000; (4)102×73-2×73 =(102-2)×73, =100×73, =7300. |
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