92 . 22 . 82 =?
Cho12+22+32+...+82+92=285.Tính q=22+42+62+...+162+182
2² + 4² + 6² + ... + 16² + 18²
= 4.(1 + 2² + 3² + ... + 8² + 9²)
= 4.285
= 1140
q=22+42+62+...+182
q= 12.22+22.22+32.22+...+92.22
q= 22.(12+22+32+...+92)
q= 22.285=4.285=1140
A=12+22+32....82+92 A=
2+12+22...+72+82+92 thì chữ số tận cung là bao nhiêu?
Chữ số tận cùng là 6 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
chu so tan cung la so 0,nho **** cho minh nhe !
Xét xem các biểu thức sau có bằng nhau hay không? 12 + 62 + 82 và 22 + 42 + 92
ta có: 12 + 62 + 82=1 + 36 + 64 = 101
22 + 42 + 92 = 4 + 16 + 81 = 101
Vậy 12 + 62 + 82 = 22 + 42 + 92
(102+82+62+42+22)−(12+32+52+72+92)
Tính nhanh giúp vs ak
\(\left(102+82+62+42+22\right)-\left(12+32+53+72+92\right)\)
\(=102+82+62+42+22-12-32-52-72-92\)
\(=\left(102-92\right)+\left(82-72\right)+\left(62-52\right)+\left(42-32\right)+\left(22-12\right)\)
\(=10+10+10+10+10\)
\(=10.5\)
\(=50\)
tim chu so tan cung cua cac tich sau :
2 * 12 * 22 * ........... * 82 * 92
Bài 4. Tính bằng cách thuận tiện nhất
a ) 3,71 × 65 + 3,71 × 25 + 10 × 3,71
b ) 235,8 × 1 100 + 92, 17 ∶ 100 − 27,97 × 0,01
c ) 1,53 × 82 + 8,2 × 1,53 × 10 + 1,53 × 22 − 1,53 × 86
a ) 3,71 × 65 + 3,71 × 25 + 10 × 3,71
=\(3,17X\left(65+25+10\right)\)
=\(3,17X100\)
=\(317\)
14x + 54 = 82
175 + (30 - x) = 2001
1551- 10 (x + 1) = 55
5 . (x + 12) + 22 = 92
6 . (x + 23) + 40 = 100
14x + 54 = 82
14x = 28
x = 2
175 + (30 - x) = 2001
30 - x = 1826
x = 30 - 1826
x = - 1796
1551 - 10 ( x + 1 ) = 55
10(x + 1) = 1496
x + 1 = 149,6
x = 148,6
5 . (x + 12) + 22 = 92
5 . (x + 12) = 70
x + 12 = 14
x = 2
6 . (x + 23) + 40 = 100
6 . (x + 23) = 60
x + 23 = 10
x = - 13
\(14x+54=82\)
\(\Leftrightarrow14x=82-54\)
\(\Leftrightarrow14x=28\)
\(\Leftrightarrow x=2\)
Vậy \(x=2\)
\(175+\left(30-x\right)=2001\)
\(\Leftrightarrow30-x=2001-175\)
\(\Leftrightarrow30-x=1826\)
\(\Leftrightarrow x=-1796\)
Vậy \(x=-1796\)
\(1551-10\left(x+1\right)=55\)
\(\Leftrightarrow10.\left(x+1\right)=1551-55\)
\(\Leftrightarrow10.\left(x+1\right)=1496\)
\(\Leftrightarrow x+1=\frac{1496}{10}\)
\(\Leftrightarrow x=\frac{1486}{10}\)
Vậy \(x=\frac{1486}{10}\)
\(5.\left(x+12\right)+22=92\)
\(\Leftrightarrow5.\left(x+12\right)=70\)
\(\Leftrightarrow x+12=14\).
\(\Leftrightarrow x=2\)
Vậy \(x=2\)
\(6.\left(x+23\right)+40=100\)
\(\Leftrightarrow6.\left(x+23\right)=60\)
\(\Leftrightarrow x+23=10\)
\(\Leftrightarrow x=-13\)
Vậy \(x=-13\)
chữ số tận cùng của tích sau là chữ số mấy ? Giải thích vì sao ?
2 x 12 x 22 x 32 x 42 x 52 x 62 x 72 x 82 x 92
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