規定：x△y=3x-2y，已知x△（4△1）=7，求x的比值

x△（4△1）=x△（3×4-2×1）=x△（12-2）=x△10=3x-2×10=3x-20=7
有方程：
3x-20=7
3x=7+20
3x=27
x=27÷3
x=9

RELATED INFORMATIONS

1. 規定：x三角形y=3x-2y，已知：x三角形（4三角形1）=7
2. 根據規則x△y=3x-2y，則x△（4△1）=7，求x=？（四則運算法則不變）
3. 關於x y的方程組x+y=a，3x-2y=7，x＞y，則a應滿足什麼條件
4. 已知|x-7+|y+13|=0，求3x+2y的值.
5. 已知x+2y=1，求2／x + 1／y的最小值
6. 已知x^2+y^2=4，則x^2+2y的最小值是
7. 若x＞0，y＞0，且x+2y=4，則1x+2y的最小值為___.
8. （創新擴展）已知{x-y+2>=0，x+y-4>=0,2x-y-5
9. 已知|x|
10. 已知|x|≤1，|y|≤1，且u=|x+y|+|y+1|+|2y-x-4|，則u的最大值和最小值的和為多少？
11. 已知x，y均為正實數，且xy=x+y+3，則xy的最小值為______.
12. 設x，y均為正實數，xy=8+x+y，則xy的最小值是
13. 3X^2+XY+Y=15求XY.
14. 問道sat數學題 The median of a list of 99 consecutive integers is 60.What is the greatest integer in the list？
15. 學長，北師大版的.
16. 北大綠卡人教版數學七年級下册30頁12題答案是什麼？
17. 八年級人教版數學下册北大綠卡數學答案
18. 誰有初一下英語的北大綠卡，我不是抄答案，是寫完了對答案，切切！
19. 北大綠卡八年級上册英語答案（完形填空） Jeff is very __1__at math. Kate，is not good aiis.Jeffoften help her __2__hermaths.Onenigh Jeff and Kate __3__out their exercise-books and began __4__theirlessons.SoonJeff finished his homework，but his sister __5__.She couldn't work out the last probiem.“Let me __6__you，“said Jeff.”No，please __7__.I'll do it __8__，“saidKate.Shethought and thought，and __9__an hour she worked itout.She__10__very tired，but very，very happy. 1. A.well B.good C.better D.best 2. A.to B.in C.with D.of 3. A.make B.takes C.took D.to take 4. A.make B.to make C.do D.to do 5. A.don't B.can't C.didn't D.finishedn't 6. A.help B.to help C.to call D.say to 7. A.don't B.didn't C.can't D.couldn't 8. A.himself B.myself C.herself D.by me 9. A.before B.behind C.after D.in 10.A.be B.is C.was D.were
20. 北大綠卡八年級英語上Unit9答案