zengfantingking
幼苗
共回答了11个问题采纳率:81.8% 举报
对有理数a b定义一种新运算"⊕":a⊕b=2ab-b分之a,
列如(-3)⊕4=2乘以(-3)乘以4-4分之-3=-23又4分之1.
(-3)⊕(-5)
=2×(-3)×(-5)-(-3)/(-5)
=30-3/5
=29+2/5
=29又5分之2;
2.0除以 [10 ⊕(-10) ]
=2÷(2×10×(-10)-10/(-10))
=2÷(-200+1)
=2/(-199)
=-2/199;
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1年前
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