Toán Lớp 7: $\text{/x+1/+/x-2/+/x-5/+/x-7/ với 3≤x≤5}$
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Toán Lớp 7: $\text{/x+1/+/x-2/+/x-5/+/x-7/ với 3≤x≤5}$
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=(x+x-x-x)+(1-2+5+7)