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Tính
a) 215+(-38)-(-58)+90-85
=177-(-58)+90-85
=235+90-85
=240
b) 31-[(26-(209+35)]
=31-[26-244]
=31-(-218)
=249
c) (+33)-(-46)+(-32)-(+15)
=79+(-32)-(+15)
=47-15
=32
d) (1267-196)-(267+304)
=1071-571
=500
c) (-298)+(-300)+(-302)
=-598+(-302)
=-900
**** mk nha
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th1: x - 250 = 298
x = 298 + 250
x = 548
th2: x - 250 = -298
x = -298 + 250
x = -48
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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
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B=-1+(4-7)+(10-13)+...+(292-295)+298
B=-1+(-3)+(-3)+...+(-3)+298
Có 49 số (-3)
B=-1+49*(-3)+298
B=-1+(-147)+298
B=(-148)+298
B=150
Vậy B=150
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298/719:(1/4+1/12-1/3)-2011/2012
=298/719:0/12-2011/2012
=0-2011/2012
=-2011/2012
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3 x 125 x 8 + 4 x 24 x 35 + 4 x 35 x 2 x 12
= 375 x 8 + 96 x 35 + 140 x 24
= 3000 + 3360 + 3360
= 3000 + 3360 x 2
= 3000 + 6720
= 9720
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300-296+292-288+…+12-8+4
=(300-296)+(292-288)+…+(12-8)+4
Có số cặp là: ((300-8):4+1):2=37(cặp)
=>300-296+292-288+…+12-8+4
=4+4+…+4+4
=4.37+4
=4.38
=152
(298-x) :4= 35]
298-x=35x4
298-x=140
x=298-140
x=158
tk nhé
(298-x) :4 = 35
298-x= 35x4
298-x=140
x=298-140
x=158
tk nhé