Toán Lớp 6: 1.tính
a)7×8+8×9+9×10+…+19.20
b)1/1×2+1/2×3+1/3×4+…+1/19×20
2. Tìm GTNN
a) P=2|x+3|+5
b) Q=|x-3|+2|x-2y|+7
c) R=|x+5|+|x+7|
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Toán Lớp 6: 1.tính
a)7×8+8×9+9×10+…+19.20
b)1/1×2+1/2×3+1/3×4+…+1/19×20
2. Tìm GTNN
a) P=2|x+3|+5
b) Q=|x-3|+2|x-2y|+7
c) R=|x+5|+|x+7|
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