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Bài 1. tìm x :
a, -16 + 23 + x = -16
23 + x = -16-(-16)
23 + x = 0
x = 0 - 23
Vậy: x = -23
b, 2x - 35 = 15
2x = 15 + 35
2x = 50
x = 50 : 2
Vậy: x = 25
c, 3x + 17 = 12
3x = 12 - 17
3x = -5
Vậy: x = -5/3
d, | x - 1 | = 0
x - 1 = 0
x = 0 + 1
Vậy: x = 1
e, -13 . | x | = -26
-13 . x = -26
x = -26 : ( -13 )
Vậy: x = 2
Mik làm bài 1 còn bài 2 bn tự làm nha
Hok tốt!!!
a,\(\frac{4}{5}\)- \(\frac{7}{6}\)+\(\frac{-6}{15}\)
=\(\frac{24}{30}\)-\(\frac{35}{30}\)+\(\frac{-12}{30}\)
=\(\frac{-11}{30}\)+\(\frac{-12}{30}\)=\(\frac{-23}{30}\)
b, \(\frac{-5}{9}\)x \(\frac{7}{13}\)+\(\frac{6}{13}\)x\(\frac{-5}{9}\)+\(\frac{34}{9}\)
= \(\frac{-5}{9}\)x [ \(\frac{7}{13}\)+\(\frac{6}{13}\)] +\(\frac{34}{9}\)
= \(\frac{-5}{9}\)x1 + \(\frac{34}{9}\)
=\(\frac{-5}{9}\)+\(\frac{34}{9}\)
= \(\frac{29}{9}\)
c, \(\frac{51}{8}\) - [\(\frac{35}{8}\)-\(\frac{1}{2}\)]
= \(\frac{51}{8}\)- \(\frac{31}{8}\)
\(\frac{20}{8}\)
d,\(\frac{7}{3}\)x 1,5 - (\(\frac{11}{10}\) + 50%) : \(\frac{4}{5}\)
= \(\frac{7}{3}\)x\(\frac{3}{2}\)- ( \(\frac{11}{10}\)+ \(\frac{1}{2}\)) : \(\frac{4}{5}\)
= \(\frac{7}{2}\)- \(\frac{8}{5}\): \(\frac{4}{5}\)
= \(\frac{7}{2}\)- \(\frac{2}{1}\)
= \(\frac{7}{2}\) - \(\frac{4}{2}\)
= \(\frac{3}{2}\)
\(a,\dfrac{-19}{34}-\left(\dfrac{31}{51}-\dfrac{54}{35}\right)=\dfrac{-19}{34}-\left(-\dfrac{1669}{1785}\right)=\dfrac{79}{210}\\ b,\dfrac{-2}{5}.\dfrac{4}{15}+\left(-0,4\right).\dfrac{26}{15}=-\dfrac{8}{75}-\dfrac{52}{75}=-\dfrac{4}{5}\)