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A=\(\frac{9^2\times5^3\times2^3}{2^3\times9}\)=\(\frac{9\times5^3}{1}\)=1125
B= 24.325+24x276+24.389 = 24x(325+276+389) = 24x990 = 23760
\(\left[504-\left(5^2.8+70\right):3^3+6\right]:25\)
\(\left[504-\left(25.8+70\right):27+6\right]:25\)
\(\left[504-\left(200+70\right):27+6\right]:25\)
\(\left[504-270:27+6\right]:25\)
\(\left[504-10+6\right]:25\)
\(\left[494+6\right]:25\)
\(500:25\)
= 20
\(\left[504-(5^2\cdot8+70):3^3+6\right]:25\)
\(=\left[504-(25\cdot8+70):27+6\right]:25\)
\(=\left[504-(200+70):27+6\right]:25\)
\(=\left[504-270:27+6\right]:25\)
\(=\left[504-10+6\right]:25\)
\(=\left[494+6\right]:25\)
\(=500:25=20\)
\(\text{Ko chắc }:)\)
\(b,\left(1^2+2^3+3^4+4^5\right).\left(1^3+2^3+3^3+4^3\right).\left(3^8-81^2\right)\)
\(=\left(1^2+2^3+3^4+4^5\right).\left(1^3+2^3+3^3+4^3\right).\left[3^8-\left(3^4\right)^2\right]\)
\(=\left(1^2+2^3+3^4+4^5\right).\left(1^3+2^3+3^3+4^3\right).\left(3^8-3^8\right)\)
\(=\left(1^2+2^3+3^4+4^5\right)\left(1^3+2^3+3^3+4^3\right).0=0\)
a, = 71995 . ( 72 - 1) : 71995 = 49 - 1 = 48
b, = ........... x ( 38 - 38) = 0
(23.94+93.45):(92.10-92)
= ( 8. 94+93.9.5):(81.10-81)
= (8.94+94.5):(810-81)
=[94.(8+5)]:729
=[94.13]:729
=6561.13:729
=6561:729.13
=9.13
=117
Mk nhanh nhat day
(23.94+93.45):(92.10-92)
=(23.94+5.94):(81.10-81)
=[94.(8+5)]:(810-81)
=(6561.13):729
=85296:729
=117
a,4x52-81: 32
=4.25-81:9
=100-9
=91
b,33x22-33x19
=27.22-27.19
=27.(22-19)
=22.3
=66
dấu(.) thay cho dấu(x)
\(a,4\cdot5^2-81:3^2=4\cdot25-81:9=100-9=91\)
\(b,3^3\cdot22-3^3\cdot19=3^3\left(22-19\right)=3^3\cdot3=3^4\)