www.rtmj.net > 括号3/4%3/16反括号乘以括号2/9+1/3反括号

括号3/4%3/16反括号乘以括号2/9+1/3反括号

(3/4-3/16)×(2/9+1/3) =9/16×5/9 =5/16

解: 3/4-3/16*(2/9+1/3) =3/4-3/16 *(2+3)/9 =3/4-3/16

(3/4-3/16)×(2/9+1/3) =9/16×5/9 =5/16

3/8x(-1)又2/5x括号-2又2/3x1又9/16x括号-4又4/7 解:原式=3/8x(-

这里面的规律要间隔一个数来看 1 2 4 8 16 32

少了个符号吧 后面的括号

(3/4一3/16)x(2/9+1/3) =(12/16一3/16)x(2/9+3/9) =9/

(3/4-3/16)×(2/9+1/3) =(12/16-3/16)x(2/9+3/9) =9/

n(n+1)(2n+1)/6。 解答过程如下: 解:利用恒等式(n+1)^3=n^3+3n^2+3n

原式=(12/16-3/16)x(2/9+3/9) =(9/16)x(5/9)=5/16

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