题目内容
求使下列式子有意义的x的取值范围(3′×4=12′)
(1) (2) (3)+ (4)
(1) (2) (3)+ (4)
(1)x≥5 (2)x≤1/5 (3)x=5 (4)x≤3且x≠2
(1)由题意得x-5≥0,解得x≥5
(2))由题意得1-5x≥0,解得x≤1/5
(3)由题意得2x-5="0," 解得x=5
(4)由题意得3-x≥0且x-2≠0, 解得x≤3且x≠2
(2))由题意得1-5x≥0,解得x≤1/5
(3)由题意得2x-5="0," 解得x=5
(4)由题意得3-x≥0且x-2≠0, 解得x≤3且x≠2
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