X325和x125
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25x3x125简便计算解题步骤:
25x3x125=(25x3)x125(结合律)=75x125=(80-5)x125(拆项,将75拆分成80-5)=80x125-5x125(分配律)=10000-5x(100+20+5)(拆项,将125拆分成100+20+5)=10000-(5x100+5x20+5x5)(分配律)=10000-5x100-5x20-5x5(去括号,括号前是减号,括号内各项要变号)=10000-500-100-25=9500-100-25=9400-25=9375
25x3x125=(25x3)x125(结合律)=75x125=(80-5)x125(拆项,将75拆分成80-5)=80x125-5x125(分配律)=10000-5x(100+20+5)(拆项,将125拆分成100+20+5)=10000-(5x100+5x20+5x5)(分配律)=10000-5x100-5x20-5x5(去括号,括号前是减号,括号内各项要变号)=10000-500-100-25=9500-100-25=9400-25=9375
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