△+○-○=6 △十○=15 口x△=63 △= ○= 口=

x十5十x十6…=1000 1/(x^2一4x十3)十1/(x^2一8x十15)十1/(x^2-12x十35)十1/(x^2一16x十63)= 已知1十x十x^2 十x^3=0,求x十x^2十x^3十x^4+x^5十x^6+x^7十x^8的值 1十3十5十7十9十11十、、、、、、十99=()=()x() X.(X十1)x(X十2)x(x十3) =360 1十1十7十8十6十7十7十9十lo十28=? 1十2十3十4十5十6十7十8十9十10= 4(X十3)=6x 2x十8十3x十8十4x十8=?请算出这道题目求士寸佰了⑥ o十口=91,△十口=63,△十0二46,0,△,口数字填多少 3x十7x十5x一7x=17十18 5x十2x=42 15十2x一3=48 2x十3x十17=37 6x一3x=6÷5 9x一2x=1