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-10 + (x - 16) + 9=−10+(x−16)+9
-10 + x - 16 + 9 = -10 + x - 16 +9
\(\Rightarrow\)-10 + x -16 = -10 + x -16
\(\Rightarrow\)-10 + x = -10 +x
\(\Rightarrow\)x - 10 = x - 10
\(\Rightarrow\)x = x
[url=http://Blog.Uhm.vN][img]http://blog.uhm.vn/emo/bobototo/44.gif[/img][/url]
\(\frac{10.\left(4^6.9^5+6^9.120\right)}{8^4.3^{12}-6^{11}}\)
=\(\frac{2.5.\left[\left(2^2\right)^6.\left(3^2\right)^5+\left(2.3\right)^9.2^3.3.5\right]}{\left(2^3\right)^4.3^{12}-\left(2.3\right)^{11}}\)
=\(\frac{2^{13}.5.3^{10}+2^{13}.5^2.3^{10}}{2^{12}.3^{12}-3^{11}.2^{11}}\)
=\(\frac{2^{13}.5.3^{10}.\left(1+5\right)}{2^{11}.3^{11}.\left(2.3-1\right)}\)
=\(\frac{4.5.6}{3.5}\)
= 8
b) x \(\ge-7\Leftrightarrow\)7+x|=7+x ⇔B=|7+x|−(x−8)=7+x−x+8=15
c)|x+3|+|x−4| TH1: x≤−3 <=> |x+3|+|x−4|=−x−3+4−x=1−2x
TH2: −3<x≤4 <=> |x+3|+|x−4|=x+3+4−x=7
TH3: x > 4 <=>|x+3|+|x−4|=x+3+x-4=2x-1
a, 410.815=220.245=265
b,415.530=230.530=(2.5)30=1030
c, \(\frac{2^{10^{ }}.13+2^{10^{ }}.65}{2^{8^{ }}.104}\)
=\(\frac{2^{10}\left(13+65\right)}{2^8.2^2.26}\) =\(\frac{2^{10}.78}{2^{10}.26}\) =\(\frac{78}{26}\)=3
-5+(x-10)+4
= x-10-5+4
=x-11
hok tốt
=> -5 + x - 10 + 4 = -5 + x - 10 + 4
= -5 + x - 10 + 4 + 5 - x + 10 -4
= [( - 5 ) + 5] + [x + (-x)] + [(-10) + 10] + [4 + (-4)]
= 0 + 0 + 0 + 0
HỌC TỐT !