配套习题- 约束条件下求代数式最值的解题策略 -【青果学院】

1/5单选题

难度：

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

正确答案：Qg==

PGRpdj7op6PvvJriiLU2LWHnmoTlgLzkuLrpnZ7otJ/mlbDvvIw8YnI+4oi0Ni1h4omlMO+8jDxicj7np7vpobnlvpfvvIw8YnI+LWHiiaUtNu+8jDxicj7ns7vmlbDljJYx5b6X77yMPGJyPmHiiaQ277ybPGJyPuaVhemAiUI8L2Rpdj4=

2/5单选题

难度：

2.

代数式|x-2|+5的最小值为（）

A	0
B	1
C	3
D	5

正确答案：RA==

PGRpdj7op6PvvJriiLV8eC0yfOKJpTDiiLR8eC0yfOeahOacgOWwj+WAvOS4ujDvvIx8eC0yfCs155qE5pyA5bCP5YC85Li6NTwvZGl2Pg==

3/5单选题

难度：

3.

代数式8-（x-1）²的最大值是（）

A	2
B	8
C	0
D	-8

正确答案：Qg==

PGRpdj7op6PnrZTvvJriiLXvvIh4LTHvvIk8c3VwPjI8L3N1cD7iiaUw77yM4oi0Le+8iHgtMe+8iTxzdXA+Mjwvc3VwPuKJpDDvvIw8YnI+4oi0OC3vvIh4LTHvvIk8c3VwPjI8L3N1cD7iiaQw77yM4oi0OC3vvIh4LTHvvIk8c3VwPjI8L3N1cD7nmoTmnIDlpKflgLzmmK8477yMPGJyPuaVheetlOahiOS4ujguPC9kaXY+

4/5单选题

难度：

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

正确答案：Qg==

PGRpdj7op6PvvJriiLVh77ycMmLvvIxi77ycM2PvvIxj77ycNGTvvIxk77ycNTDvvIxh44CBYuOAgWPjgIFk6YO95piv5pW05pWwPC9kaXY+PGRpdj7iiLRh4omkMmItMe+8jGLiiaQzYy0x77yMY+KJpDRkLTHvvIxk4omkNTAtMT00OTwvZGl2PjxkaXY+4oi0ZOacgOWkpzQ577yMY+acgOWkpzE5Ne+8jGLmnIDlpKc1ODTvvIxh5pyA5aSnMTE2NzwvZGl2PjxkaXY+4oi06YCJQjwvZGl2Pg==

5/5单选题

难度：

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

正确答案：RA==

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