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(1/3)∧7等于多少

(1/3)∧7 =1/(3^7) =1/2187

7^1/3=7的开立方

原式=(-7/3)*(-3/7)=1

1-3/7-1/3 =1-9/21-7/21 =5/21

1/1×3+1/3×5+1/5×7+……+1/2011×2013 =1/2×(1-1/3+1/3-1/5+1/5-1/7+……+1/2011-1/2013) =1/2×(1-1/2013) =1/2×2012/2013 =1006/2013

原式=(16/20+5/20)*3/7+7/10=21/20*3/7+7/10=9/20+14/20=23/20

21分之5 21分之5 21分之5

-3³-7×(2/7-3) =-27-7×(-19/7) =-27+19 =-8 12÷(1/2-1/3-1/4) =12÷(-1/12) =-144

这个需要用整体思想 设1/3+1/5+1/7=a,则原式可化为 (1+a)(a+1/9)-(1+a+1/9)a =a+1/9+a²+a/9 -a-a²-a/9 =1/9

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