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a, 1024 : (17.25 + 15.25) = 210 : [25.(17+15)] = 210 : (25. 25) = 210 : 210 =1
b, (5.35 + 17.34) : 62 = 34.(5.3 + 17) : (2.3)2 = 34.25 : (22.32) = 32.23=72
c, (23.94 + 93.45) : (92.10 - 92) = 94.(23 + 5) : [92.(10-1)] = 94.13 : 93 = 9.13 =117
Đúng thì nha
\(\frac{9^3.8+9^3.45}{9^4.2^3+9^4.15}\)
\(=\frac{9^3.\left(8+45\right)}{9^4.\left(8+15\right)}\)
\(=\frac{53}{9.23}\)
\(=\frac{53}{207}\)
Study well
a. 5(x+35)=515
=> x+35=515:5
=> x+35=103
=> x = 103-35
=> x = 68
b. (x+40).15=75.12
=>(x+40).15=900
=>x+40=900:15
=>x+40=60
=>x=60-40
=>x=20
c.460+85.4=(x+200):4
=>460+340=(x+200):4
=>800=(x+200):4
=>800.4=x+200
=>3200=x+200
=>x=3200-200
=>x=3000
\(\left(2^3\cdot9^4+9^3\cdot45\right):\left(9^2.10-9^2\right)=\)\(\left(8.6561+729.45\right):\left(81.10-81\right)\)
\(=\left(52488+32805\right):\left(810-81\right)\)
\(=\left(85293\right):\left(729\right)\)\(=117\)
\(\left(2^3\cdot9^4+9^3\cdot45\right):\left(9^2\cdot10-9^2\right)\)
\(=\left(8.9^4+9^3.9.5\right):\left(810-81\right)\)
\(=\left(8\cdot9^4+9^4.5\right):729\)
\(=6561\left(8+5\right):729\)
\(=85293:729=117\)
\(\left(2^3.9^4+9^3.45\right):\left(9^2.10-9^2\right)\)
\(=\left(2^3.9^4+9^3.\left(9.5\right)\right):\left[9^2.\left(10-1\right)\right]\)
\(=\left[2^3.9^4+9^4.5\right]:\left(9^2.9\right)\)
\(=9^4.\left(2^3+5\right):9^3\)
\(=\left(2^3+5\right).\left(9^4:9^3\right)\)
\(=\left(8+5\right).9\)
\(=13.9\)
\(=117\)
(23 . 94 + 93 . 45) : (92 . 10 - 92)
= (23 . 94 + 94 . 5): [92 . (10 - 1)]
= 94 (23 + 5) : [92 . (10 - 1)]
= 94 . 13 : 93
= 9 . 13
= 117.
Vậy.....
a=810
b=9477:1053=9