(-5)^2n 1 5x(-5)^2n=
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写的看不懂哦第三题选BD对角相加之比为1:1新年快乐---------不对,正方的应该是1:1:1:1题目都出问题了
=-5/2+28/5*(1/2)*(-5/14)=-5/2-1=-3/2
5÷5+5÷5=2(小学六年级奥数题)
解题思路:2/5+5/2=4/10+25/10=29/10解题过程:2/5+5/2=4/10+25/10=29/10
=(-1/2)+(9/2)-(9又1/2)+(9又3/4)=(9/2)-(1/2)-9+9+(3/4-2/4)=4+1/4=4又1/4=3/2-1/2+18/5+39/5-2/5=1+(18+39-2
(5-5+5)*(5-5)=0(5+5)/5-(5/5)=15-(5+5+5)/5=2(5*5+5)/(5+5)=3
(5÷5)+(5÷5)=2
选择D,若该数为非负数,则|-51/2-()|=|-(51/2+())|=51/2+()|-51/2|+|()|=51/2+()其余都不满足
2-5的相反数是5-2,绝对值是5-2,倒数是-2-5.故答案为5-2;5-2;-2-5.
(3x-2*5)-(3*5-2x)=53X-10-15+2X=55X-25=55X=5+255X=30X=6
5+5^2+5^3+...+5^2013=5×(1-5^2013)/(1-5)=(5/4)(1-5^2013);=5/4-5^(2014)/4;很高兴为您解答,skyhunter002为您答疑解惑如果
令a=1+5+5^2+5^3+5^4+5^5+5^6+…………5^2012则5a=5+5^2+5^3+5^4+5^5+5^6+…………5^2012+5^2013相减4a=5^2013-1所以原式=a=
(-5)^2*(-3/5)+32除以(2^2)*(-5/4)=25*(-3/5)+32÷4*(-5/4)=-15+8*(-5/4)=-15-10=-25
5-5/5-5/5=30+5-5/5-5/5=3(1+5)/(5/5+5/5)=3-2+5-5+5*5/5=3
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