Toán Lớp 6: tính A=2 mũ 100-2 mũ 99-2 mũ 98-…-2 mũ 2-2
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Toán Lớp 6: tính A=2 mũ 100-2 mũ 99-2 mũ 98-…-2 mũ 2-2
Comments ( 1 )
a,A=2100−299+298−297+…+22−2a,A=2100-299+298-297+…+22-2
⇒2A=2101−2100+299−298+…+23−22⇒2A=2101-2100+299-298+…+23-22
⇒2A+A=2101−2⇒2A+A=2101-2
⇒3A=2101−2⇒3A=2101-2
⇒A=2101−23