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a: -127+208-73+92
\(=\left(-127-73\right)+\left(208+92\right)\)
\(=300-200=100\)
b: \(-46+391+246-691\)
\(=\left(-46+246\right)+\left(391-691\right)\)
\(=200-300=-100\)
c: \(-472+\left(235-28\right)-\left(35-350\right)\)
\(=-472+235-28-35+350\)
\(=\left(-472-28\right)+350+\left(235-35\right)\)
\(=-500+350+200=50\)
a) -127+208-73+92
=(−127−73)+(208+92)
=300−200
=100
b) −46+391+246−691
=(−46+246)+(391−691)
=200−300
=−100
c) −472+(235−28)−(35−350)
=−472+235−28−35+350
=(−472−28)+350+(235−35)
=−500+350+200
=50
-472 + (235 - 28) - (35 - 350)
= -472 + 235 - 28 - 35 + 350
= (-472 - 28) + (235 - 35) + 350
= -500 + 200 + 350
= -500 + 550
= 50
a: \(-472+\left(235-28\right)-\left(35-350\right)\)
\(=-472+235-28-35+350\)
\(=\left(-472-28\right)+\left(235-35\right)+350\)
=-500+350+200
=50
b: \(91\cdot172+91\cdot13-91\cdot85\)
\(=91\cdot\left(172+13-85\right)\)
\(=91\cdot100=9100\)
c: \(798-298:\left[19-2\left(5^2-22\right)^2\right]\cdot1^{2023}\)
\(=798-298:\left[19-2\left(25-22\right)^2\right]\)
\(=798-298:\left[19-2\cdot3^2\right]\)
\(=798-298:\left(19-18\right)\)
=798-298
=500
a.
\(\dfrac{3}{4}+\dfrac{1}{4}:x=-3\)
\(\dfrac{1}{4}:x=-3-\dfrac{3}{4}\)
\(\dfrac{1}{4}:x=-\dfrac{15}{4}\)
\(x=\dfrac{1}{4}:\left(-\dfrac{15}{4}\right)\)
\(x=-\dfrac{1}{15}\)
b.
\(\dfrac{4}{7}x-x=\dfrac{-9}{14}\)
\(\Leftrightarrow\left(\dfrac{4}{7}-1\right)x=\dfrac{-9}{14}\)
\(\Leftrightarrow-\dfrac{3}{7}x=-\dfrac{9}{14}\)
\(\Leftrightarrow x=-\dfrac{9}{14}:\left(-\dfrac{3}{7}\right)\)
\(\Leftrightarrow x=\dfrac{3}{2}\)
c.
\(\dfrac{1}{2}x+\dfrac{3}{5}x=\dfrac{-2}{3}\)
\(\Leftrightarrow\left(\dfrac{1}{2}+\dfrac{3}{5}\right)x=-\dfrac{2}{3}\)
\(\Leftrightarrow\dfrac{11}{10}x=-\dfrac{2}{3}\)
\(\Leftrightarrow x=-\dfrac{2}{3}:\dfrac{11}{10}\)
\(\Leftrightarrow x=-\dfrac{20}{33}\)
Lời giải:
n. $\frac{1}{4}:x=-3-\frac{3}{4}=\frac{-15}{4}$
$x=\frac{1}{4}: \frac{-15}{4}=\frac{-1}{15}$
o.
$\frac{4}{7}x-x=\frac{-9}{14}$
$x(\frac{4}{7}-1)=\frac{-9}{14}$
$x.\frac{-3}{7}=\frac{-9}{14}$
$x=\frac{-9}{14}: \frac{-3}{7}=\frac{3}{2}$
p.
$\frac{1}{2}x+\frac{3}{5}x=\frac{-2}{3}$
$x(\frac{1}{2}+\frac{3}{5})=\frac{-2}{3}$
$x.\frac{11}{10}=\frac{-2}{3}$
$x=\frac{-2}{3}: \frac{11}{10}=\frac{-20}{33}$
b) (-624) – [ (376 + 235) – 35]
= -624-(376+235-35)
= -624-(376+200)
= -624-576= -1200
(-321)-[(-321+35)-235]
=(-321)+321-35+235
=[(-321)+321]+[(-35)+235]
=0+200
=200
-472 + (235 - 28) - 35 - 350
= -472 + 207 - 35 - 350
= -265 - 35 - 350
= 300 - 350 = -50
-50