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a) \(-317+402-583+98\)
\(=85-583+98\)
\(=-498+98\)
\(=-400\)
-200-(1861-655)+61-2655
= -200-1861+655+61-2655
= -200+(-1861+61)+(-2655+655)
= -200+(-1800)+(-2000)
= -2000+(-2000)=-4000
a, 35.34 + 35.86 + 65.75 + 65.45
= 35.(34 + 86) + 65.(75 + 45)
= 35.120 + 65.120
= 120.(35+65)
= 120.100
= 12000
b, \(7.5^2-32:2^3+9\)
= 7.25 - 32:8 + 9
= 175 - 4 + 9
= 180
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) \(135\cdot47+135\cdot52+135\cdot2021^0\)
\(=135\cdot\left(47+52+2021^0\right)\)
\(=135\cdot\left(99+1\right)\)
\(=135\cdot100\)
\(=13500\)
a) (-124) + 24 = -100
b) 37. 78 + 37. 22
= 37 . ( 78 + 22 )
= 37 . 100
= 3700
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