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a: =5,3+5,1-5,3+4,9=10
b: =2,7-51,4-48,6+7,3
=10-100=-90
c: =2,5(-0,124+10,124)=2,5x10=25
d: =6,3-6,3+4.9=4,9
e: =15,3-21,5-4,5=-10,7
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1).15,3-21,5-3.1,5 = -10.7
2).2(4 2-2.4,1)+1,25:5 = 0.300370048 ( cái nài mik bấm máy ra vậy nếu sai thì bảo mik nha )
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a) 8 + 2. ( − 3 ) = 8 + ( - 6 ) = 8 - 6 = 2
b) 30.55 + 30.46 – 2.15
= 30 . 55 + 30 . 46 - 30
= 30 . ( 55 + 46 - 1 )
= 30 . 100 = 3000
c) 4.15 − [ 144 − ( 12 − 4 )2 ]
= 4 . 15 - [ 144 - 82 ]
= 4 .15 - [ 144 - 64 ]
= 60 - 80
= - 20
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\(\frac{11.3^{22}.3^7-9^{15}}{\left(3^{14}\right)^2}\)
\(=\frac{11.3^{29}-3^{30}}{3^{28}}\)
\(=\frac{3^{29}.\left(11-3\right)}{3^{28}}\)
\(=3.8=24\)
\(\frac{11.3^{22}.3^7-9^{15}}{ \left(3^{14}\right)^2}\)
= \(\frac{11.3.3^{21}.3^7-\left(3^2\right)^{15}}{\left(3^{14}\right)^2}\)
= \(\frac{33.3^{28}-3^{30}}{3^{28}}\)
= \(\frac{33.3^{28}-3^{28}.9}{3^{28}}\)
= \(\frac{3^{28}.\left(33-9\right)}{3^{28}}\)
= \(\frac{24}{1}=24\)
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Bài 1:
a, (-33) + 45 + (-67)
= - (33 + 67) + 45
= - 100 + 45
= - 55
c, 75 : [ (153 - 6.52).8 + 20110 ]
= 75 : [ 153 - 312].8 + 1]
= 75 : [ - 159.8 + 1]
= 75 : [-1272 + 1]
= 75 : (-1271)
= - \(\dfrac{75}{1271}\)
Bài 2
6\(x\) + 15 = 75
6\(x\) = 75 - 15
6\(x\) = 60
\(x\) = 60 : 6
\(x\) = 10
mọi người giải cạng kẽ nha!
=-6,2-4,5=-10,7