奥数简便运算一,3.6*31又2/5+43.9*6又2/5+6二,(81.4+1/6+1/4+1/5)/(1/6+1/4+1/5)三,51又2/3除以5/3+71又3/4除以7/4+91又4/5除以9/5四,6又7/10*121+444除以40/99+67*21.2五,(4又1/19-1/17)*(1/7+1/8+1/9)-4*(1/7-1/8+1/9)

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