Bài 7: Phép trừ hai số nguyên

(-3)x-(6-2x)=4*(-7)-8

=>\(-3x-6+2x=-28-8\)

=>\(-x-6=-36\)

=>-x=-36+6=-30

=>x=30

-3 . x - (6 - 2x) = 4 . (-7) - 8

=> -3x - 6 + 2x = -28 - 8

=> -x - 6 = -36

=> -x = -30

=> x = 30

Lời giải:

$(-10)-21-18=-(10+21+18)=-49$

=-49

-15-(-75)

=-15+75

=60

\(333-\left[\left(-14657\right)+57\right]-78\)
\(=333-\left(-14600\right)-78\)
\(=333+14600-78\)
\(=14855\)
#Kễnh

f: =-46-64-91+220

=220-110-91

=110-91=19

g: =4-2:2=3

h: ={47-736:2^4}*2013

=2013(47-184)

=-137*2013=-275781

\(\dfrac{11}{8}:x-\dfrac{2}{5}+-\dfrac{1}{6}=-\dfrac{1}{5}\\ =>\dfrac{11}{8}:x-\dfrac{2}{5}=-\dfrac{1}{5}-\left(-\dfrac{1}{6}\right)\\ =>\dfrac{11}{8}:x-\dfrac{2}{5}=-\dfrac{1}{5}+\dfrac{1}{6}\\ =>\dfrac{11}{8}:x-\dfrac{2}{5}=-\dfrac{6}{30}+\dfrac{5}{30}\\ =>\dfrac{11}{8}:x-\dfrac{2}{5}=-\dfrac{1}{30}\\ =>\dfrac{11}{8}:x=-\dfrac{1}{30}+\dfrac{2}{5}\\ =>\dfrac{11}{8}:x=-\dfrac{1}{30}+\dfrac{12}{30}\\ =>\dfrac{11}{8}:x=\dfrac{11}{30}\\ =>x=\dfrac{11}{8}:\dfrac{11}{30}\\ =>x=\dfrac{11}{8}.\dfrac{30}{11}\\ =>x=\dfrac{30}{8}\\ =>x=\dfrac{15}{4}\\ \dfrac{4}{7}x-\dfrac{1}{3}x+\left(-\dfrac{16}{21}\right)=-\dfrac{2}{3}\\ =>\left(\dfrac{4}{7}-\dfrac{1}{3}\right)x=-\dfrac{2}{3}-\left(-\dfrac{16}{21}\right)\\ =>\left(\dfrac{12}{21}-\dfrac{7}{21}\right)x=-\dfrac{2}{3}+\dfrac{16}{21}\\ =>\dfrac{5}{21}x=-\dfrac{14}{21}+\dfrac{16}{21}\\ =>\dfrac{5}{21}x=\dfrac{2}{21}\\ =>x=\dfrac{2}{21}:\dfrac{5}{21}\)

\(=>x=\dfrac{2}{21}.\dfrac{21}{5}\\ =>x=\dfrac{2}{5}\\ -\dfrac{11}{12}x+\dfrac{15}{2}\left(x+-\dfrac{1}{5}\right)=\dfrac{67}{8}\\ =>-\dfrac{11}{12}x+\dfrac{15}{2}.x-\dfrac{1}{5}=\dfrac{67}{8}\\ =>\left(-\dfrac{11}{12}+\dfrac{15}{2}\right)x=\dfrac{67}{8}+\dfrac{1}{5}\\ =>\left(-\dfrac{11}{12}+\dfrac{90}{12}\right)x=\dfrac{335}{40}+\dfrac{8}{40}\\ =>\dfrac{79}{12}x=\dfrac{343}{40}\\ =>x=\dfrac{343}{40}:\dfrac{79}{12}\\ =>x=\dfrac{343}{40}.\dfrac{12}{79}\\ =>x=\dfrac{343.12}{40.79}\\ =>x=\dfrac{343.3}{10.79}\\ =>x=\dfrac{1029}{790}\)

1: \(=\left(-15+15\right)+\left(17-17\right)+\left(-22+22\right)=0\)

2: \(=\left(8-8\right)+\left(-37+37\right)+\left(70-70\right)+10=10\)

3 \(=\left(45-45\right)+\left(-43+43\right)+25-29=-4\)

4: \(=-4+4+\left(-14+14\right)+\left(52-52\right)+5=5\)

5: \(=\left(-15+15\right)+\left(-17+17\right)+19-18=1\)

1: =-4+8-15+10

=6-7=-1

2: =-7+12-9+10

=22-16

=6

3: =16+3-5-7+12

=31-12

=19

\(\left(\sqrt{72354}\right)^2\)

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