怎样做下面的题目(要用最简便的)
4个回答
2013-03-29
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设123456789=x,987654321=y所以123456789x987654321-123456788x987654322可化为xy-(x-1)(y+1)=xy-(xy+x-y-1)=xy-xy-x+y+1=-x+y+1=-123456789+987654321+1=86419733
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123456789x987654321-123456788x987654322
=123456789x987654321-(123456789-1)x987654322
=123456789x987654321-123456789x987654322+987654322
=123456789×(987654321-987654322)+987654322
=-123456789+987654322
=864197533
=123456789x987654321-(123456789-1)x987654322
=123456789x987654321-123456789x987654322+987654322
=123456789×(987654321-987654322)+987654322
=-123456789+987654322
=864197533
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=123456789*987654321-123456788*(987654321+1)
=123456789*987654321-123456788*987654321-123456788
=(123456789-123456788)*987654321-123456788
=987654321-123456788
=864197533
=123456789*987654321-123456788*987654321-123456788
=(123456789-123456788)*987654321-123456788
=987654321-123456788
=864197533
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123456789x987654321-123456788x987654322
=123456789x987654321-(123456789-1)x987654322
=123456789x987654321-123456789x987654322+987654322
=123456789×(987654321-987654322)+987654322
=-123456789+987654322
=864197533
=123456789x987654321-(123456789-1)x987654322
=123456789x987654321-123456789x987654322+987654322
=123456789×(987654321-987654322)+987654322
=-123456789+987654322
=864197533
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