A=2^12.3^5-4^6.9^2/(2^2.3)^6+8^4.3^5
A=2^12.3^5-4^6.9^2\(2^2.3)^6+8^4.3^5 - 5^10.7^3-25^5.49^2\(125.7)^3+5^9.14^3
2^12.3^5-4^6.9^2/(2^2.3)^6+8^4.3^5-5^10.7^3-25^5.49^2/(125.7)^3+5^9.14^3
B=2^12.3^5-4^6.9^2/(2^2.3)^6+8^4.3^5-5^10-25^5.49^2/(125.7)^3+5^9.14^3
(2^12.3^5-4^6.9^2) / [(2^2.3)^6 +8^4.3^5] - (5^10.7^3-25^5.49^2) / [(125.7)^3+5^9.14^3]
thực hiện phép tính
a) 81^11.3^17/27^10.9^15
b) A=2^12.3^5-4^6.9^2/(2^2.3^6)+8^4.3^5-5^10.7^3-25^5.49^2/(125.7)^3+5^9
giúp mình vowisddang cần gấp. cảm ơn
a) 81^11.3^17/27^10.9^15
=(9^2)^11.3^17/(3^3)^10.9^15
=3^44.3^17/3^30.3^30
=3^61/3^60
=3
b) A =( (2^12.3^5 - 2^12.3^4)/ (2^12.3^6 + 2^12.3^5) ) - ((5^10.7^3 - 5^10.7^4)/(5^9.7^3 + 5^9.2^3.7^3))
=(2^12.3^4(3-1))/2^12.3^5(3+1) - 5^10.7^3(1-7)/5^9.7^3(1+8)
=2/12- (-30/9)=1/6 + 10/3 = 7/2
\left(4\dfrac{4}{9} + 5\dfrac{4}{11}\right) -1\dfrac{4}{9} =(494+5114)−194
Rút gọn biểu thức : A= 2^12.3^5-4^6.81/(2^2.3)^6+8^4.3^5
2^12.3^5-4^6.9^2/(2^2.3)^6
\(\dfrac{2^{12}.3^{5}-4^{6}.9^{2}}{(2^{2}.3)^{6}}\)
\(=\dfrac{2^{12}.3^{5}-2^{12}.3^{4}}{2^{12}.3^{6}}\)
\(=\dfrac{2^{12}.3^{4}(3-1)}{2^{12}.3^{4}.3^{2}}\)
\(=\dfrac{2}{9}\)
gửi đến bạn vũ thu trang
4^6x9^5+6^9x120/8^4x3^12-6^11
= (2^2)^6.(3^2)^5 + (2.3)^9.3.5.2^3 / (2^3)^4.3^12 - (2.3)^11
= 2^12.3^10 + 2^9.3^9.3.5.2^3 / 2^12.3^12 - 2^11.3^11
= 2^12.3^10 + 2^12.3^10.5 / 2^11.2. 3^11.3 - 2^11.3^11
= 2^12.3^10.(1+5) / 2^11.3^11.(6-1)
= 2^12.3^10.6 / 2^11.3^11.5
= 4/5
Nhiwf bạn nên mình làm được bài này ! Hihi
TÍNH GIÁ TRỊ BIỂU THỨC :
A=\(\frac{2^{21}.3^5-4^6.9^2}{\left(2^2.3\right)^6+8^4.3^5}\)