Toán Lớp 7: 1. Tìm x, y biết.
a) |x-2|+|2x+y|≤0
b) |x-2|+|x-5|≤3
3. Tìm x, biết:
a) 2x + 8 ≤ 0
b) 4x-7 ≥ 2x -5
c) (2x-8)(15-3x)>0
d) (10-2x)(8+2x)≤0
6. Tìm GTNN
P= |2x-8|+|2x-10|
Q= |x-3|+|2y-5|
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Toán Lớp 7: 1. Tìm x, y biết.
a) |x-2|+|2x+y|≤0
b) |x-2|+|x-5|≤3
3. Tìm x, biết:
a) 2x + 8 ≤ 0
b) 4x-7 ≥ 2x -5
c) (2x-8)(15-3x)>0
d) (10-2x)(8+2x)≤0
6. Tìm GTNN
P= |2x-8|+|2x-10|
Q= |x-3|+|2y-5|
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