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(0.027)1/3平方减(-1/7)-2平方+(2乘7/9)1/2...

没有过程。。O次方答案就是1

(0.027 ) - 1 3 -(- 1 7 ) -2 +(2 7 9 ) 1 2 -( 2 -1 ) 0 = 1 3 0.027 - 1 (- 1 7 ) 2 + 25 9 -1 = 1 0.3 -49+ 5 3 -1=-45 .故答案为-45.

(1) 原式=[ (0.3) 3 ] - 1 3 - 7 2 +( 25 9 ) 1 2 -1-45 = 10 3 -49+ 5 3 -1-45=-90 .(2) -1≤x+ 1 4 ≤1 -1≤x- 1 4 ≤1 ∴ - 3 4 ≤x≤ 3 4 .

2

7/3乘以2/21乘以7/9乘以3/5除以(1/7+2/7) =2/9x7/9x3/5÷3/7 =14/81x3/5x7/3 =14/135x7/3 =98/405

1^2+(1×2)^2+2^2 = 9 =3^2 2^2+(2×3)^2+3^2 = 49 =7^2 3^2+(3×4)^2+4^2 = 169 = 13^2 ... (1)可以得到 n^2 + (n(n+1))^2 + (n+1)^2 = (n(n+1)+1)^2 (2) 上面等式的右边 (n(n+1)+1)^2 =(n(n+1))^2+2n(n+1)+1 =(n(n+1))^2+2n^2+2n+1 =(n(n+1))^2+n...

(7/9)x7+2/9=(1/9)x(7x7+2)=51/9=17/3 1/3+(3/4)x1.6=1/3+3x0.4=23/15 1-(5/9)x(5/7)=1-25/63=38/63 0.06x(5-2/3)=0.3-0.02x2=0.26=13/50 2/3-2.4x(7/36)=2/3-2x(7/30)=10/15-7/15=1/5

汗!看了好几遍才看懂题 (-3/5--5/9+7/12)除1/36= -21.6+20+21 =19.4 负7/9的绝对值除(2/3--1/5)--1/3乘(-4)的平方= (35/39) - (16/9) =0.88 -1的平方= 1

原式= (1+2+...+9) -(1/2+2/2+3/2+...+8/2) +(1/3+2/3+...+7/3) -(1/4+2/4+...+6/4) +(1/5+...+5/5) -(1/6+...+4/6) +(1/7+2/7+3/7) -(1/8+2/8) +1/9 =45-36/2+28/3-21/4+15/5-10/6+6/7-3/8+1/9 =33+5/504

原式= (1/2)(2/3)(3/4)(4/5)(5/6)(6/7)(7/8)(8/9)/(0.1+0.9+0.2+0.8+0.3+0.7+0.4+0.6+0.5) 分子可以约分,约分后很简单,可得分子为1/9,分母组合后算出来是4.5,分子除以分母 原式=1/9/4.5=2/81

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