D,[1104-(25×8+40)]:9+81:9
[1104-(25×8+40)]÷9+3^16÷3^12+17^0
[1104-(25×8+40)]÷9+3^16÷3^12+17^0=178
\(\frac{1104-\left(25\cdot8+40\right)}{9}+\frac{3^{16}}{3^{12}}+17^0=\frac{1104-\left(200+40\right)}{9}+3^4+1\)
\(=\frac{1104-240}{9}+81+1\)
\(=\frac{864}{9}+82=96+82=178\)
thực hiện phép tính A=[1104-(25*8+40)]*9+3^16/3^12+17^0
chình bày phép tính ra cho mình nha ai làm đúng mik tích cho
A = [1104 - (25 . 8 + 40)] . 9 + 316 : 312 + 170 = [1104 - (200 + 40)] . 9 + 316-12 + 1 = (1104 - 240) . 9 + 34 + 1
= 864 . 9 + 81 + 1 = 7776 + 82 = 7858
tính giá trị của các biểu thức sau :
a) [ 545 - ( 45 + 4. 25 ) ] : 50 - 200 : 250 + 215 : 213
b) [ 504 - ( 25 . 8 + 70 ) ] : 9 - 15 + 190
c) 5 . { 26 - [ 3 . 5 + 2 . 5 ) + 15 ] : 15 }
d) [ 1104 - ( 25 . 8 + 40 ) ] : 9 + 316 : 312
[545 - (45 + 4 x 25)] : 50 - 200 : 250 + 215 : 213
= [545 - (45 + 100)] : 50 - 200 : 250 + 22
= (545 - 4500) : 50 - 200 : 254
= (-3955) : 50 + 200 : 254
= [(-3955) + 200] : (50 + 254)
= (-3755) : 304
= bạn tự tính nha
[504 - (25 x 8 + 70)] : 9 - 15 + 190
= [504 - (200 + 70)] : 9 - 15 + 0
= (504 - 270) : 9 - 15
= 234 : 9 - 15
= 26 - 15
= 9
5 x {26 - [3 x 5 + 2 x 5 + 15] : 15}
= 5 x {26 - [(3 + 2) x 5) + 15] : 15}
= 5 x {26 - [5 x 5 + 15] : 15}
= 5 x [26 - (25 + 15) : 15]
= 5 x (26 + 25 - 15 : 15)
= 5 x (51 - 1)
= 5 x 50 = 250
d) [1104 - (25 x 8 + 40)] : 9 + 316 : 312
= [1104 - (200 + 40)] : 9 + 34
= (1104 - 240) : 9 + 81
= 864 : 9 + 81
= 96 + 81
= 177
Học tốt!!!
[1104-(25×8+10)] ÷9+3^16÷3^12+17^0
[1104 - (25.8 + 40)]: 9 + 316 : 312
Helppppppp meeeeeee
A= [1104 - (25.8+40)]:9+3^16.3^12+17^0
= [1104 - (200+40)] : 9 +316-12+1
=[1104-240] : 9 + 34+1
=864 :9 + 81 +1
=96+81+1
178
đây bn
[1104 - (25.8 + 40)]: 9 + 316 : 312
= [1104 - (25.8 + 40)]: 9 + 316-12
= [1104 - (200 + 40)]: 9 + 34
= [1104 - 240]: 9 + 81
= 864 : 9 + 81
= 432 + 81
= 513
Tìm x biết:
a, (x + 9)×9 = 81
b, (x + 24)÷9 = 7
c, x - 56 = 8×9
d, x + 25 = 9×10
A = [1104 - (25.8+40)]:9 + 3^16 . 3^12 + 17^0
A= [1104 - (25.8+40)]:9+3^16.3^12+17^0
= [1104 - (200+40)] : 9 +316-12+1
=[1104-240] : 9 + 34+1
=864 :9 + 81 +1
=96+81+1
178
a)A=1+2+3+4+...+25
b)B=2+4+6+8+...+50
c)C=3+5+7+9+...51
d)D=1+5+9+13+...81
a) Vì tổng A có 25 số hạng nên A = \(\dfrac{\left(1+25\right).25}{2}=325\)
b) Số số hạng là:
\(\left(50-2\right):2+1=25\) \(\left(số\right)\)
Tổng là:
\(\left(2+50\right).25:2=650\)
c) Số số hạng là:
\(\left(51-3\right):2+1=25\) \(\left(số\right)\)
Tổng là:
\(\left(3+51\right).25:2=675\)
d) Số số hạng là:
\(\left(81-1\right):4+1=21\) \(\left(số\right)\)
Tổng là:
\(\left(1+81\right).21:2=861\)
\(#Wendy.Dang\)
Tính hợp lí nếu có thể:
a)3/7+4/9+4/7+5/9
b)1/5+4/10+9/15+16/20+25/25+36/30+49/35+64/40+81/45
c)1/8+1/12+3/8+5/12
d)(1-1/2)x(1-1/3)x(1-1/4)x...x(1-100)
e)9/5:17/15+8/5:17/15
f)2/1x2+2/2x3+2/3x4+...+2/19x20
Ai nhanh nhất mình tick cho
a) 3/7 + 4/9 + 4/7 + 5/9
= ( 3/7 + 4/7 ) + ( 4/9 + 5/9 )
= 7/7 + 9/9
= 1 + 1
= 2
b)1/5 + 4/10 + 9/15 + 16/20 + 25/25 + 36/30 + 49/35 + 64/40 + 81/45
= 1/5 + 2/5 + 3/5 + 4/5 + 5/5 + 6/5 + 7/5 + 8/5 + 9/5
= ( 1/5 + 9/5 ) + ( 2/5 + 8/5 ) + (7/5 + 3/5 ) + ( 4/5 + 6/5 ) + 5/5
= 2 + 2 + 2 + 2 + 1
= 2 x 4 + 1
= 8 +1
= 9
c) 1/8 + 1/12 + 3/8 + 5/12
= ( 1/8 + 3/8 ) + ( 1/12 + 5/12)
= 4/8 + 6/12
= 1/2 + 1/2
= 2/4 = 1/2
mỏi tay rồi
d; (1 - \(\dfrac{1}{2}\)) x (1 - \(\dfrac{1}{3}\)) x (1 - \(\dfrac{1}{4}\)) x ... x ( 1 - \(\dfrac{1}{100}\))
= \(\dfrac{1}{2}\) x \(\dfrac{2}{3}\) x \(\dfrac{3}{4}\) x \(\dfrac{3}{4}\) x ... x \(\dfrac{99}{100}\)
= \(\dfrac{1}{100}\)
e; \(\dfrac{9}{5}\) : \(\dfrac{17}{15}\) + \(\dfrac{8}{5}\) : \(\dfrac{17}{15}\)
= \(\dfrac{9}{5}\) x \(\dfrac{15}{17}\) + \(\dfrac{8}{5}\) x \(\dfrac{15}{17}\)
= \(\dfrac{27}{17}\) + \(\dfrac{24}{17}\)
= \(\dfrac{51}{17}\)
= 3