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a)1,3(12)=\(\dfrac{1}{10}.\left(13+12.\dfrac{1}{99}\right)\)=\(\dfrac{443}{330}\)
b)\(3,3\left(21\right)=\dfrac{1}{10}\left(33+21.\dfrac{1}{99}\right)=\dfrac{548}{165}\)
c)\(5,2\left(24\right)=\dfrac{1}{10}\left(52+24.\dfrac{1}{99}\right)=\dfrac{862}{165}\)
d)\(3,32\left(6\right)=\dfrac{1}{100}\left(332+6.\dfrac{1}{9}\right)=\dfrac{499}{150}\)
A, 1,3(12) = \(\dfrac{433}{330}\)
B, 3,3(21) = \(\dfrac{548}{165}\)
C,5,2(24) = \(\dfrac{862}{165}\)
D,3,32(6) = \(\dfrac{499}{150}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) (-0,5).5.(-50).0,02.(-0,2).2 = [(-0,5) . (-0,2)] . (5 . 2) . [(-50) . 0.02] = 0,1 . 10 . (-1) = 10 . (-1) = -10
b) (+9)+(-3,6)-(+4,1)-(-1,3) = 9 -3,6 - 4,1 + 1,3 = 2,6
c) (+5,2)-(+6,7)-(-5,6)+(-4,1) = 5,2 - 6,7 + 5,6 - 4,1 = (5,2 - 6,7) + (5,6 - 4,1) = -1,5 + 1,5 = 0
d) (+2,7)-(-4,3)+(-8,6)-(-0,6) = 2,7 + 4,3 - 8,6 + 0,6 = (2,7 + 4,3) - (8,6 - 0,6) = 7 - 8 = -1
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(...=0,25+1500+\left(0,5\right)^2=0,25+0,25=1500=1500,5\)
b) \(...=2,7-4,4+5,6-7,3=2,7+5,6-4,4-7,3=8,3-11,7=-3,4\)
c) \(...=-5,44+5+0,44=-5,44+0,44+5=-5+5=0\)
d) \(...=6,72+5,27-0,72-1,27=6,72-0,72+5,27-1,27=6+4=10\)
![](https://rs.olm.vn/images/avt/0.png?1311)
bài 2)
a)|12,1x+12,1.0,1|=12,1
<=> |12,1(x+0,1)|=12,1
<=>\(\left[\begin{array}{nghiempt}12,1\left(x+0,1\right)=12,1\\12,1\left(x+0,1\right)=-12,1\end{array}\right.\)
<=> \(\left[\begin{array}{nghiempt}x=0,9\\x=-1,1\end{array}\right.\)
b) |0,2x-3,1|+|0,2+3,1|=0
<=>|0,2x-3,1|+3,3=0
ta có |A|>=0
=> pt trên vô nghiệm
bài 1) a) 6,5+1,2+3,5-5,2+6,5-4,8
=(6,5+3,5+6,5)-(5,2-1,2+4,8)
=15,5-8,8=24,6
tt nha bạn