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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: Bài 1:Tính các tổng sau a)B=1+5+5²+5³+...5mũ 100 b)D=1+9+9²+…+9mũ 2019 Bài 2:Chứng minh rằng : a)A=2+2²+2³+…+2mũ 60 chia hết cho 3;5;7 b)7+7²+7³+…+7mũ 99+7mũ 100 chia hết cho 8;50 { "@context": "https://schema.org", ...

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