中学生网络课堂本课配套习题挑战模式1/5
单选题
难度系数：
1.
代数式6-a的值为非负数，则a应为（ ）
| A: a≥6 |
| B: a≤6 |
| C: a≥-6 |
| D: a≤-6 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+Ni1h55qE5YC85Li66Z2e6LSf5pWw77yM5omA5LulNi1h4omlMO+8jOWIqeeUqOS4jeetieW8j+eahOWfuuacrOaAp+i0qO+8jOWwhuS4pOi+ueS4jeetieW8j+WQjOaXtuWHj+WOuzblho3pmaTku6UtMe+8jOS4jeetieWPt+eahOaWueWQkeaUueWPmO+8jOWNs+WPr+ino+W+l2HnmoTlgLwuPC9wPg==
- 答案：Qg==
PGRpdj7op6PvvJriiLU2LWHnmoTlgLzkuLrpnZ7otJ/mlbDvvIw8YnI+4oi0Ni1h4omlMO+8jDxicj7np7vpobnlvpfvvIw8YnI+LWHiiaUtNu+8jDxicj7ns7vmlbDljJYx5b6X77yMPGJyPmHiiaQ277ybPGJyPuaVhemAiUI8L2Rpdj4=
本课配套习题挑战模式3/5
单选题
难度系数：
3.
代数式8-（x-1）2的最大值是（ ）
| A: 2 |
| B: 8 |
| C: 0 |
| D: -8 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+Le+8iHgtMe+8iTxzdXA+Mjwvc3VwPuKJpDA8L3A+
- 答案：Qg==
PGRpdj7op6PnrZTvvJriiLXvvIh4LTHvvIk8c3VwPjI8L3N1cD7iiaUw77yM4oi0Le+8iHgtMe+8iTxzdXA+Mjwvc3VwPuKJpDDvvIw8YnI+4oi0OC3vvIh4LTHvvIk8c3VwPjI8L3N1cD7iiaQw77yM4oi0OC3vvIh4LTHvvIk8c3VwPjI8L3N1cD7nmoTmnIDlpKflgLzmmK8477yMPGJyPuaVheetlOahiOS4ujguPC9kaXY+
本课配套习题挑战模式4/5
单选题
难度系数：
4.
已知a、b、c、d都是整数，且a＜2b，b＜3c，c＜4d，d＜50，那么a的最大值是
（ ）
| A: 1157 |
| B: 1167 |
| C: 1191 |
| D: 1199 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+YeKJpDJiLTHvvIxi4omkM2MtMe+8jGPiiaQ0ZC0x77yMZOKJpDUwLTE9NDk8L3A+
- 答案：Qg==
PGRpdj7op6PvvJriiLVh77ycMmLvvIxi77ycM2PvvIxj77ycNGTvvIxk77ycNTDvvIxh44CBYuOAgWPjgIFk6YO95piv5pW05pWwPC9kaXY+PGRpdj7iiLRh4omkMmItMe+8jGLiiaQzYy0x77yMY+KJpDRkLTHvvIxk4omkNTAtMT00OTwvZGl2PjxkaXY+4oi0ZOacgOWkpzQ577yMY+acgOWkpzE5Ne+8jGLmnIDlpKc1ODTvvIxh5pyA5aSnMTE2NzwvZGl2PjxkaXY+4oi06YCJQjwvZGl2Pg==
本课配套习题挑战模式5/5
单选题
难度系数：
5.
a、b、c是正整数，且a+b=20.a+c=24，设a+b+c的最大值为x，最小值为y，则x+y=
( )
| A: 62 |
| B: 64 |
| C: 66 |
| D: 68 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5oqKYStiK2PnlKjlkKth55qE5byP5a2Q6KGo56S6PC9wPg==
- 提示2：PHA+5qC55o2uYeOAgWLjgIFj5piv5q2j5pW05pWw77yM56Gu5a6aYeeahOWPluWAvOiMg+WbtDwvcD4=
- 答案：RA==
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
