Tính nhanh:
a, A= 1.3+5.7+9.11+…+97.99
b, B= 1.2.3+2.3.4+3.4.5+…+98.99.100
Tính nhanh: a, A= 1.3+5.7+9.11+…+97.99 b, B= 1.2.3+2.3.4+3.4.5+…+98.99.100
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Tính nhanh:
a, A= 1.3+5.7+9.11+…+97.99
b, B= 1.2.3+2.3.4+3.4.5+…+98.99.100