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73
7 tháng 11 2021
\(B=8\left(1+8+8^2\right)+...+8^{19}\left(1+8+8^2\right)\)
\(=73\left(8+...+8^{19}\right)⋮73\)
NC
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là:
3
2 tháng 11 2021
106 - [24 - (6\(^2\) - 12 . 3)\(^3\)] : 3
= 106 - [24 - ( 36 - 36 )\(^3\)] :3
= 106 - [24 - 0] :3
= 106 - 24 : 3
= 106 - 8
= 98
-Tick cho mình nha mình cảm ơn. <3
N
1
2 tháng 7 2016
11+12+13+14+15+16+17+18+19+...+89+88+87+86+85+84+83+82
=( 11 + 89 )+(12+88)+(13+87)+(14+86)+(15+85)+(16+84)+(17+83)+(18+82)+19
=100+100+100+100+100+100+100+100+19
=800+19
=819
2 tháng 12 2015
a)16+(-17)+....+(-83)+84=(-17+16)+(-19+17)+....+(-83+82)+84=(-1)+(-1)+...+(-1)+84=(-1)*34+84=-34+84=50
b)x+(1+4+7+...+100)=1993
x+1717=1993
x=1993-1717
x=276
TY
0
LY
3
15 tháng 11 2021
Câu 17: Viết kết quả phép tính sau dưới dạng một luỹ thừa: 87: 8 là:
A. 86 B. 85 C. 84 D. 83
Câu 18: Cho biều thức M = 75 + 120 + x. Giá trị nào của x dưới đây thì M ⋮ 3
A.x = 7 B.x= 5 C.x =4 D.x =12
Câu 19: Tổng nào sau đây chia hết cho 7 ?
A.49 + 70 B.14 + 51 C.7 + 134 D.10+16
Câu 20: Số tự nhiên m chia cho 45 dư 20 có dạng là:
A. 45 + 20k B. 45k – 20 C. 45 – 20k D. 45k + 20
Câu 21: Điền chữ số vào dấu * để chia hết cho 3: ???
A. {0; 3; 6}. B.{1; 3; 6; 9}. C.{3; 6; 9}. D.{0; 6; 9}.
9 tháng 1 2022
\(\Leftrightarrow\dfrac{x+100}{86}+\dfrac{x+100}{85}+\dfrac{x+100}{84}+\dfrac{x+100}{83}=0\)
=>x+100=0
hay x=-100
trả lời
\(16+83+84+7\)
\(=190\)
hok tốt
16+83+84+7=(16+84)+(83+7)=100+100=200
chúc bạn học tốt !