c) (39 - 19) : (-2) + (34 - 22).5
d) 204:{80-[70:2-(23 +3.5)]} + 20230
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d) 204:{80-[70:2-(23 +3.5)]} + 20230
= 204 :{ 80 -[ 70 : 2 - ( 8 + 3 . 5)]} + 1
= 204 :{ 80 -[ 70 : 2 - ( 8 + 15)]} + 1
=204 :{ 80 -[ 70 : 2 -23]} + 1
=204 :{ 80 -[ 35 - 23]} + 1
= 204 :{ 80 -12} + 1
= 204 : 68 + 1
= 3 + 1
= 5
a) $18\cdot7-8\cdot7$
$=7\cdot(18-8)$
$=7\cdot10$
$=70$
b) $(-15)-14+(-85)$
$=[(-15)+(-85)]-14$
$=(-100)-14$
$=-114$
c) $(39-19):(-2)+(34-22)\cdot5$
$=20:(-2)+12\cdot5$
$=(-10)+60$
$=50$
d) $75-(3\cdot5^2-25\cdot5^2)$
$=75-(3\cdot25-25\cdot25)$
$=75-(75-625)$
$=75-75+625$
$=625$
d) $75-(3\cdot5)=75-15=60$
A=\(2^2-9^3+4^{-2}.16-2.5^2\)
\(=4-729+1-50=-774\)
B=\(\left(2^3.2\right).\dfrac{1}{2}+3^{-2}.3^2-7.1+5\)
\(B=2^4.\dfrac{1}{2}+1-7+5=8+1-7+5=7\)
C = 2-3 + (52)3.5-3 + 4-3.16 - 2.32 - 105.(\(\dfrac{24}{51}\))0
C = \(\dfrac{1}{8}\) + 56.5-3 + 4-3.42 - 2.9 - 105.1
C = \(\dfrac{1}{8}\) + 53 + \(\dfrac{1}{4}\) - 18 - 105
C = (\(\dfrac{1}{8}\) + \(\dfrac{1}{4}\)) - (105 - 125 + 18)
C = \(\dfrac{3}{8}\) - (-20 + 18)
C = \(\dfrac{3}{8}\) + 2
C = \(\dfrac{19}{8}\)
a) 86 – 16 = 70
b) 23 x 2 – 1 = 23
c) 250 : 5 + 5 = 25
d) 40 + 80 : 4 = 30
e) 80 + 4 : 2 = 42
f) 70 + 30 : 2 = 50
g) 90 + 30 x 3 = 180
h) 70 + 30 : 2 = 85
22 x 43 - 625 : {[504 - (52 x 8 + 70) : 32 + 6] : 20 + 20230}
= 4 x 64 - 625 : {[504 - (25 x 8 + 70) : 9 + 6] : 20 + 1}
= 256 - 625 : {[504 - (200 + 70) : 9 + 6] : 20 + 1}
= 256 - 625 : {[504 - 270 : 9 + 6] : 20 + 1}
= 256 - 625 : {[504 - 30 + 6] : 20 + 1}
= 256 - 625 : {[474 + 6] : 20 + 1]
= 256 - 625 : {480 : 20 + 1]
= 256 - 625 : {24 + 1}
= 256 - 625 : 25
= 256 - 41
= 215
22 x 43 - 625 : {[504 - (52 x 8 + 70) : 32 + 6] : 20 + 20230}
= 4 x 64 - 625 : {[504 - (25 x 8 + 70) : 9 + 6] : 20 + 1}
= 256 - 625 : {[504 - (200 + 70) : 9 + 6] : 20 + 1}
= 256 - 625 : {[504 - 270 : 9 + 6] : 20 + 1}
= 256 - 625 : {[504 - 30 + 6] : 20 + 1}
= 256 - 625 : {[474 + 6] : 20 + 1]
= 256 - 625 : {480 : 20 + 1]
= 256 - 625 : {24 + 1}
= 256 - 625 : 25
= 256 - 41
= 215
Lời giải:
c. $=20:(-2)+12.5=-10+60=50$
d. $204:[80-(35-23)]+1=204:68+1=3+1=4$
c. =20:(−2)+12.5=−10+60=50=20:(−2)+12.5=−10+60=50
d. 204:[80−(35−23)]+1=204:68+1=3+1=4