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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
![](https://rs.olm.vn/images/avt/0.png?1311)
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
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[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!!!
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[1104-(200+40)]:9+316-12
=[1104-240]:9+34
=864:9+81
=96+81
=177
![](https://rs.olm.vn/images/avt/0.png?1311)
=\(\left[1104-\left(200+40\right)\right]:9+3^{16-12}\)
=\(\left[1104-240\right]:9+3^4\)
=\(864:9+3^4\)
=\(96+81\)
=177
nhớ k cho mình nha
![](https://rs.olm.vn/images/avt/0.png?1311)
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
[1104-(25×8+40)]÷9+3^16÷3^12+17^0=178
\(\frac{1104-\left(25\cdot8+40\right)}{9}+\frac{3^{16}}{3^{12}}+17^0=\frac{1104-\left(200+40\right)}{9}+3^4+1\)
\(=\frac{1104-240}{9}+81+1\)
\(=\frac{864}{9}+82=96+82=178\)