264÷6÷439x24÷645X(81-47)如何用脱式计算？
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264÷6÷439x24÷645X(81-47)
= 264x24x34/(6x439x645)
【用6约分】
=44 x24x34/(439x645)
【用3约分】
= 44 x8x34/(439x215)
=4x11x34x8/[(440-1)x5x43]
=4x11x272/[2200-5)x43]
=4x(10+1)x272/(200x11x43-215)
=4x(2720+272)/(200x473-215)
=4x2992/(94600-215)
=11968/94385
= 264x24x34/(6x439x645)
【用6约分】
=44 x24x34/(439x645)
【用3约分】
= 44 x8x34/(439x215)
=4x11x34x8/[(440-1)x5x43]
=4x11x272/[2200-5)x43]
=4x(10+1)x272/(200x11x43-215)
=4x(2720+272)/(200x473-215)
=4x2992/(94600-215)
=11968/94385
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