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1: =-2/9(15/17+2/17)=-2/9
2: \(=\dfrac{-6}{3}+\dfrac{-21}{90}\)
=-2-7/30=-67/30
3: \(=\dfrac{3}{4}\cdot\dfrac{7}{5}+\dfrac{9}{7}\cdot\dfrac{3}{2}\)
=21/20+27/14=417/140
4: =-25/13(5/19+14/19)=-25/13
5: =-7/5-45/21=-7/5-15/7=-124/35
1: =-2/9(15/17+2/17)=-2/9
2: =−63+−2190=−63+−2190
=-2-7/30=-67/30
3: =34⋅75+97⋅32=34⋅75+97⋅32
=21/20+27/14=417/140
4: =-25/13(5/19+14/19)=-25/13
5: =-7/5-45/21=-7/5-15/7=-124/35
Ta có: \(x-\dfrac{3}{13}+\dfrac{9}{20}-10\%\)
\(=x-\dfrac{60}{260}+\dfrac{117}{260}-\dfrac{26}{260}\)
\(=x+\dfrac{31}{260}\)
\(x-\dfrac{3}{13}+\dfrac{9}{20}-10\%\)
\(x-\dfrac{3}{13}+\dfrac{9}{20}-\dfrac{1}{10}\)
\(x-\dfrac{60}{260}+\dfrac{117}{260}-\dfrac{26}{260}\)
\(x-\dfrac{151}{260}\)
Ta có: \(x-\dfrac{3}{13}+\dfrac{9}{20}-10\%\)
\(=x-\dfrac{60}{260}+\dfrac{117}{260}-\dfrac{26}{260}\)
\(=x+\dfrac{31}{260}\)
1. -x+20 = -(-15)-8+13
=> -x=15-8+13-20
=> -x=0
=> x=0
2. -(-10)+x=-13+(-9)+(-6)
=> 10+x=-13-9-6
=> x = -13-9-6-10
=> x = -38
3. 8-(-12)+10=-(-14)-x
=> 8+12+10=14-x
=> x = 14-8-12-10
=> x = -16
4. -(+12)+(-x)-(-3)=5-(-7)
=> -12-x+3=5+7
=> -x=5+7+12-3
=> -x=21
=> x=-21
5. 14-x+(-10)=-(-9)+(+15)
=> 14-x-10=9+15
=> -x=9+15-14+10
=> -x=20
=> x=-20
6. 12-(-17)+(-3)=-5+x
=> 12+17-3+5=x
=> x=31
7. x-(-19)-(+32)=14-(+16)
=> x+19-32=14-16
=> x=14-16+32-19
=> x=11
8. x-|-15|-|7|=-(-9)+|-5|
=> x-15-7=9+5
=> x=9+5+7+15
=> x=36
9. 15-x+17=13-(-21)
=> 15-x+17=13+21
=> -x=13+21-15-17
=> -x=2
=> x=-2
10. -|-5|-(-x)+4=3-(-25)
=> -5+x+4=3+25
=> x=3+25-4+5
=> x=29
a; - \(\dfrac{10}{13}\) + \(\dfrac{5}{17}\) - \(\dfrac{3}{13}\) + \(\dfrac{12}{17}\) - \(\dfrac{11}{20}\)
= - (\(\dfrac{10}{13}\) + \(\dfrac{3}{13}\)) + (\(\dfrac{5}{17}\) + \(\dfrac{12}{17}\)) - \(\dfrac{11}{20}\)
= - 1 + 1 - \(\dfrac{11}{20}\)
= 0 - \(\dfrac{11}{20}\)
= - \(\dfrac{11}{20}\)
b; \(\dfrac{3}{4}\) + \(\dfrac{-5}{6}\) - \(\dfrac{11}{-12}\)
= \(\dfrac{9}{12}\) - \(\dfrac{10}{12}\) + \(\dfrac{11}{12}\)
= \(\dfrac{10}{12}\)
= \(\dfrac{5}{6}\)
c; [13.\(\dfrac{4}{9}\) + 2.\(\dfrac{1}{9}\)] - 3.\(\dfrac{4}{9}\)
= [\(\dfrac{52}{9}\) + \(\dfrac{2}{9}\)] - \(\dfrac{4}{3}\)
= \(\dfrac{54}{9}\) - \(\dfrac{4}{3}\)
= \(\dfrac{14}{3}\)
<=>38-(|x+10|+13)=-(|x+10|-25)
=>-(|x+10|-25)=32
=>-(|x+10|-25)=9
=>-(|x+10|)=9+(-25)
=>-(|x+10|)=-16
=>-(x+10)=±-16
TH1:-(x+10)=-16
=>x=-26
TH2:-(x+10)=16
=>x=6
mình không biết làm các bạn giúp mình nhé phải làm đúng 100% đấy nhé
=>x=3/13 -9/20+10/100=-31/260
\(x-\dfrac{3}{13}+\dfrac{9}{20}-\dfrac{1}{10}\)
\(=x-\dfrac{3}{13}+\dfrac{9}{20}-\dfrac{2}{20}\)
\(=x-\dfrac{3}{13}+\dfrac{7}{20}\)
\(=x-\dfrac{60}{260}+\dfrac{91}{260}\)
\(=x+\dfrac{31}{260}\)