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a)5.4.9-6^2=180-36=144
b)15:3-2^2=5-4=1
c)5.3^5:3^3-8.5=5.3^2-40=5.9-40=45-40=5
a)mk ko bt
b)15 * 35 / (35 / 34 ) - 23 *5
=15 / 3 - 4
=5 - 4
=1
c) 5 * 35 / (38 / 35 ) - 23 * 5
=5 * 35 / 27 - 23 * 5
=1215 / 27 - 40
=45 - 40
=5
d) 4* [(3 + 37 + 34)*10 + 97]-300
=4*[(3+2187+81)*10+97]-300
=4*[(2190+81)*10+97]-300
=4*[2271*10+97]-300
=4*[22710+97]-300
=4*22807-300
=9128-300
=90928
a. \(8^{x-3}.8^3=2^5.4^5\)
\(\Rightarrow8^{x-3+3}=32.1024\)
\(\Rightarrow8^{x-3+3}=32768\)
\(\Rightarrow8^{x-3+3}=8^5\)
\(\Rightarrow x-3+3=5\)
\(\Rightarrow x=5+3-3\)
\(\Rightarrow x=5\)
Vậy...
b. \(5^{3.x-2}.125=5^4\)
\(\Rightarrow5^{3x-2}.5^3=5^4\)
\(\Rightarrow5^{3x-2}=5^4:5^3=5^1\)
\(\Rightarrow3x-2=1\)
\(\Rightarrow3x=1+2=3\)
\(\Rightarrow x=3:3=1\)
Vậy...
8x-3.83=25.45
(23)x-3.(23)3=25.(22)5
23(x-3).29=25.210
23x-3.3.29=215
23x-9=215:29
23x-9=24
=>3x-9=4
3x=4+9
3x=15
x=15:3
x=5
1. A - B = 40+ 3/8 + 7/82 + 5/83 + 32/85 - (24/82 + 40+ 5/82 + 40/84 + 5/84 )
= 40.85/85 + 3.84/85 + 7.83/85 + 5.82/85 + 32/85 - 24.83/85 - 40.85/85 - 5.83/85 - 40.8/85 - 5.8/85
= 40.85/85 + 24.83/85 + 7.83/85 + 5.82/85 + 32/85 - 24.83/85 - 40.85/85 - 5.83/85 - 40.8/85 - 5.8/85
= 7.83/85 + 5.82/85 + 32/85 - 5.83/85 - 40.8/85 - 5.8/85
= 7.83/85 + 5.82/85 -8/85 - 5.83/85 - 40.8/85
= 2.83/85 + 5.82/85 - 40.8/85 - 8/85
= 2.83/85 + 40.8/85 - 40.8/85 - 8/85
= 2.83/85 - 8/85 > 0
Vay A > B
A = 82 : 4 . 3 + 2.5^2
A = 64 :4 .3 + 10.5
A = 16 .3 +50
A = 48 + 50
A = 98
= 64 : 4 . 3 + 2 . 25
= 16 . 3 + 50
= 48 + 50
= 98