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a: \(-317+402-583+98\)
\(=\left(-317-583\right)+\left(402+98\right)\)
\(=-900+500=-400\)
b: \(-200-\left(1861-655\right)+61-2655\)
\(=-200-1861+655+61-2655\)
\(=-200-\left(1861-61\right)+\left(655-2655\right)\)
\(=-200-1800-2000\)
=-4000
-200-(1861-655)+61-2655
= -200-1861+655+61-2655
= -200+(-1861+61)+(-2655+655)
= -200+(-1800)+(-2000)
= -2000+(-2000)=-4000
a) (-124) + 24 = -100
b) 37. 78 + 37. 22
= 37 . ( 78 + 22 )
= 37 . 100
= 3700
a) \(583+27+417+73\)
\(=\left(583+417\right)+\left(73+27\right)\)
\(=1000+100\)
\(=1100\)
b) \(125\cdot25\cdot4\cdot8\cdot7\)
\(=\left(125\cdot8\right)\cdot\left(25\cdot4\right)\cdot7\)
\(=1000\cdot100\cdot7\)
\(=700000\)
c) \(87-\left[61+\left(7-4\right)^2\right]\)
\(=87-\left(61+3^2\right)\)
\(=87-\left(61+9\right)\)
\(=87-70\)
\(=17\)
d) \(135\cdot47+135\cdot52+135\cdot2021^0\)
\(=135\cdot\left(47+52+2021^0\right)\)
\(=135\cdot\left(99+1\right)\)
\(=135\cdot100\)
\(=13500\)
d) -37 . (-19) + 37 . (-119)
= -37.(-19 + 119)
= -37 . 100
= -3700
e: =5/7(5/11+2/11-14/11)
=5/7(-7/11)=-5/11
f: =-5/4(2/11+9/11)+1+3/4
=-5/4+7/4
=2/4=1/2
g: =-5/7(3/13+10/13)+1+5/7
=-5/7+1+5/7
=1
h: =7/4(29/5-9/5)+41/13
=-7+41/13=-50/13
\(A=2019^2-\left(2019-3\right)\left(2019+3\right)\\ A=2019-2019^2-2019\cdot3+2019\cdot3+3^2\\ A=9\)
=-200-1861+655+61-2655
=-200-2000-1800
=-4000
bạn ơi bạn trình bày rõ hơn đc ko