-321+(-29)-142-a(-72)
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a) -321 + (-29) - 142 - (-72)
= [-321 +(-29)]+ [(-142) + 72]
= [-(321 + 29)] + [- (142 - 72)]
= (-350) + (-70)
= -(350 + 70)
= -420
b) 214 - (-36) + (-305)
= 214 + 36 - 305
= 250 - 305
= -(305 - 250)
= -55.
a, -321 + (-29 ) - 142 - (-72) = -321 - 29 - 142 + 72 = -420.
b, 214 - (-36) + (-305) = 214 + 36 - 305 = -55.
c, 232 - (581 + 132 - 331) = 232 - 581 - 132 + 331 = -150.
d, [ 12+ (-57)] - [-57 - (-12) = 12 - 57 + 57 - 12 = 0.
\(\dfrac{3}{17}\) .\(\dfrac{6}{29}\) - \(\dfrac{3}{17}\).\(\dfrac{35}{29}\) + 2022\(\dfrac{3}{17}\)
= (\(\dfrac{3}{17}\).\(\dfrac{6}{29}\) - \(\dfrac{3}{17}\).\(\dfrac{35}{29}\)) + 2022 + \(\dfrac{3}{17}\)
= \(\dfrac{3}{17}\).(\(\dfrac{6}{29}\) - \(\dfrac{35}{29}\)) + 2022 + \(\dfrac{3}{17}\)
= \(\dfrac{3}{17}\).(-1) + 2022 + \(\dfrac{3}{17}\)
= (- \(\dfrac{3}{17}\) + \(\dfrac{3}{17}\)) + 2022
= 0 + 2022
= 2022
b; \(\dfrac{5}{6}\) - (\(\dfrac{1}{3}\) + \(\dfrac{1}{2}\)).20%
= \(\dfrac{5}{6}\) - \(\dfrac{5}{6}\).\(\dfrac{1}{5}\)
= \(\dfrac{5}{6}-\dfrac{1}{6}\)
= \(\dfrac{4}{6}\)
= \(\dfrac{2}{3}\)
\(-321+\left(-29\right)-142-a\left(-72\right)\)
\(=\left(-321-29-142\right)+72a\)
\(=-492+72a\)