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巧解(-1/30)/(2/3-1/10+1/6-2/5).要用倒数及分配率来解.
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巧解(-1/30)/(2/3-1/10+1/6-2/5).要用倒数及分配率来解.
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答案和解析
(-1/30)/(2/3-1/10+1/6-2/5)的倒数为:(2/3-1/10+1/6-2/5)/(-1/30)则:(2/3-1/10+1/6-2/5)/(-1/30)=(2/3-1/10+1/6-2/5)×(-30)=-30×2/3+30×1/10-30×1/6+30×2/5= -20+3-5+12= -10则(-1/30)/(2...
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