Toán Lớp 6: Bài 6: Tính Tổng:
b, B = 1 + (-4) + 2 + (-5) + … + 20 + (-23)
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Toán Lớp 6: Bài 6: Tính Tổng:
b, B = 1 + (-4) + 2 + (-5) + … + 20 + (-23)
Comments ( 2 )
= (1 – 4) + (2 – 5) + … + (20 – 23)
= -3.20