用递等式计算(能巧算的要巧算)218+59+282+141201×995000-(39+22)×6283×183-83×83288+36×17÷516
用递等式计算(能巧算的要巧算)218+59+282+141201×995000-(39+22)×6283×183-83×83288+36×17÷516930÷[235-1...
用递等式计算(能巧算的要巧算)218+59+282+141201×995000-(39+22)×6283×183-83×83288+36×17÷516930÷[235-160÷(31+9)].
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(1)218+59+282+141, =(218+282)+(59+141), =500+200, =700; (2)201×99, =(200+1)×99, =200×99+1×99, =19800+99, =19899; (3)5000-(39+22)×62, =5000-61×62, =5000-3782, =1218; (4)83×183-83×83, =(183-83)×83, =100×83, =8300; (5)288+36×17÷51, =288+612÷51, =288+12, =300; (6)6930÷[235-160÷(31+9)], =6930÷[235-160÷40], =6930÷[235-4], =6930÷231, =30. |
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