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- 1根据补角和余角的定义可知:10度角的补角为170度,余角为80度;15度的补角为165度,余角为75度;31度角的补角为
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- 4一根绳子长50米,第一次用去它的5分之2,第二次用去5分之2,这根绳子还剩多少米?
- 5将句子合成定语从句1.The little girl was crying on the street.Her money had been stolen.
- 6用试根法因式分解:①x^4+3x^3-3x^2-11x-6②x^6+2x^5+3x^4+4x^3+3x^2+2x+1
- 7已知|x²-3xy-4y²|+2根号(x²+4xy+4y²-1)=0
- 8用筐装苹果,每筐装60只,多出40只苹果,改成每筐装65只,就空出1只筐,问苹果和筐各有几只?
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