“微信扫一扫”进入题库练习及模拟考试
阅读材料:我们知道,
已知
参考答案:\(\because a - 2b = 3\)①,\(2b - c = - 5\)②,\(c - d = 10\)③,
\(\therefore \)①\( + \)②得,\(a - c = - 2\),②\( + \)③得,\(2b - d = 5\),
\(\therefore (a - c) + (2b - d) - (2b - c)\)\( = - 2 + 5 - ( - 5)\)\( = 8\)