Cho cấp số cộng \(\left( {{u_n}} \right)\) có 5 số hạng, trong đó \({u_1} + {u_3} = 28,\,\,{u_3} + {u_5} = 40\). Tìm CSC đó.
A.\( \div \,\,11,\,\,14,\,\,17,\,\,20,\,\,23,\,\,26\).
B.\( \div \,\,11,\,\,13,\,\,15,\,\,17,\,\,19,\,\,21\).
C.\( \div \,\,-11,\,\,-14,\,\,-17,\,\,-20,\,\,-23,\,\,-26\).
D.\( \div \,\,-11,\,\,-13,\,\,-15,\,\,-17,\,\,-19,\,\,-21\).
A.\( \div \,\,11,\,\,14,\,\,17,\,\,20,\,\,23,\,\,26\).
B.\( \div \,\,11,\,\,13,\,\,15,\,\,17,\,\,19,\,\,21\).
C.\( \div \,\,-11,\,\,-14,\,\,-17,\,\,-20,\,\,-23,\,\,-26\).
D.\( \div \,\,-11,\,\,-13,\,\,-15,\,\,-17,\,\,-19,\,\,-21\).
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Hóa Học lớp 12
