10/21-0.5+1.25-1/7+1/3
=10/21-1/2+5/4-1/7+1/3
=20/42-21/42+5/4+1/7+1/3
=-2/84+105/84+1/7+1/3
=103/84-12/84+28/84
=119/84
=17/12
祝樓主學(xué)習(xí)進(jìn)步,
望采納
10/21-0.5+1.25-1/7+1/3
10/21-0.5+1.25-1/7+1/3
數(shù)學(xué)人氣：554 ℃時(shí)間：2020-06-07 16:59:26
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