x2- 14/260 - 14/416 - ... - 14/19400 = 1/25
x^2 - 14/260-14/416-...-14/19400=1/25
a) 770:[(20x+100);x]=35
b) [(8x-14):2-2].31=341
c)25.[260-(x+110)-125=0
khó quá bạn nào giúp mình với
x + (x+1) + (x+2) + (x+3) + .... + 13 + 14 = 14
25 + 24 + 23 +...+ x + (x - 2) + (x – 3) = 25
207 : { 23 x [ ( 165 x 1260 - 128 ) : 14 ] + 7 }
Tính hợp lí nhất
|
1, 2155– (174 + 2155) + (-68 + 174) 2, -25 . 72 + 25 . 21 – 49 . 25 3, 35(14 –23) – 23(14–35) 4, 8154– (674 + 8154) + (–98 + 674) 5, – 25 . 21 + 25 . 72 + 49 . 25 6, 27(13 – 16) – 16(13 – 27)
|
7, –1911 – (1234 – 1911) 8, 156.72 + 28.156 9, 32.( -39) + 16.( –22) 10, –1945 – ( 567– 1945) 11, 184.33 + 67.184 12, 44.( –36) + 22.( –28)
|
tìm số nguyên x
1) x+(x+1)+(x+2)+(x+3)+...+13+14=14
2) 25+24+23+...+x+(x-1)+(x-2)=25
Tính:
1) |-17| - (-16) - (+23)
2) - (-25) - |-14| + |-17|
3) |-14| - |-13| - |+10|
4) - |-8| - (-15) + (+9)
5) - (-15) +(-14) - (+7)
Tính:
a) ( -14) + 5 + 17 + 14 b) 40 +13 + ( -25) + ( -13)
c) ( -5) + ( -146)+ ( -15) + 14 d) ( -2) + (-5) + 20 + (- 13)
