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27/50+ (75:100) + 254/400 + (7,5:100) - 5,4

27/50+0,75+254/400+0,075

...Còn lại các bạn hãy tính nhanh nhé!!!!Kết quả bằng 2.

Hok tốt!!!!

Dễ quá đi mất ! 200 % . Tớ nói thêm là tớ có học olympic toán đấy !

cách làm nữa

=27/50+3/4+3/40+254/400

=216/400+254/400+30/40+3/40

=47/40+30/40+3/40

=80/40=2

\(\dfrac{27}{50}\) + 75% + \(\dfrac{254}{400}\) + 7,5%

 = 54% + 75% + 63,5% + 7,5%

=129% + 71%

= 200%

= 2 

1.

a) = 354

b) = -54

c) = -167

2.

A= -37

=0 còn cách lm mk ko bt

\(=\frac{7}{5}-\frac{27}{12}+\frac{3}{5}+\frac{2}{3}+\frac{1}{3}-\frac{3}{4}\) 

\(=\frac{7}{5}+\frac{3}{5}+\frac{2}{3}+\frac{1}{3}-\frac{27}{12}-\frac{9}{12}\)          

\(=2+1-3=0\)        

\(\frac{14}{10}\)\(-\frac{27}{12}\)\(+\frac{30}{50}\)\(+\frac{10}{15}\)\(+\frac{16}{48}\)\(-\frac{75}{100}\)

\(=\frac{7}{5}\)\(+\frac{27}{12}\)\(+\frac{3}{5}\)\(+\frac{2}{3}\)\(+\frac{1}{3}\)\(-\frac{3}{4}\)

\(=\frac{7}{5}\)\(+\frac{3}{5}\)\(+\frac{2}{3}\)\(+\frac{1}{3}\)\(-\frac{27}{12}\)\(-\frac{9}{12}\)

\(=2+1-3\)

\(=0\)

100+50:2+75+200:2+400:2+500

= 100 + 25 + 75 + 100 + 200 + 500

= 100 + 100 + 100 + 200 + 500

= 500 + 500

= 1000

100 + 50 : 2 + 75 + 200 : 2 + 400 : 2 + 500

= 100 + 25 + 75 + 100 + 200 + 500

= 125 + 75 + 100 + 200 + 500

= 200 + 100 + 200 + 500

= 300 + 200 + 500

= 500 + 500 

= 1000

100 + 50 : 2 + 75 + 200 : 2 + 400 : 2 + 500

= 100 + 25 + 75 + 100 + 200 + 500

= 125 + 75 + 100 + 200 + 500

= 200 + 100 + 200 + 500

= 300 + 200 + 500

= 500 + 500 

= 1000

a) mk chỉnh lại đề nhé, nếu đúng thì tham khảo:

   \(\frac{75}{100}+\frac{3}{4}\times29+75\%\times30+0,75\times40\)

\(=\frac{75}{100}+\frac{75}{100}\times29+\frac{75}{100}\times30+\frac{75}{100}\times40\)

\(=\frac{75}{100}\left(1+29+30+40\right)\)

\(=\frac{75}{100}\times100=75\)

a) 150 - 34 + 44 - 66 - 50

= (150 - 50) + (44 - 34) - 66

= 100 + 10 - 66

= 110 - 66 

= 44

b) 152 - 36 + 25 - 75

= (152 - 36) + (75 - 25)

= 116 + 50

= 166

a 150-34+44-66-50=44

b 125-36+25-75=39

a, 150 - 34 + 44 - 66 - 50

= ( 150 - 50 ) + ( 34 + 44 - 66 )

= 100 + ( 78 - 66 )

= 100 + 12  

= 112

b, 125 - 36 + 25 - 75

= (125 - 25 ) + (36 + 75)

= 100 + 111

= 211

a)  (a-b)-(c-b)-a=a-b-c+b-a=(a-a)+(b-b)-c=0+0-c=-c

1)

a) (a-b) - (c-b) - a= a - b - c + b - a = -c

b) -(300 - 400) + (300 - 400) + 100 = 100

2) a) 4x - 20 =  50 - ( 30 -3x)

        4x - 20 = 50 - 30 + 3x

        4x - 3x = 50 - 30 + 20= 40

        x          = 40

b) 100 - (-5x) = 40 - (-4x +10)

    100 + 5x    = 40 + 4x -10

    5x - 4x       = 40 - 10 -100

    x                = -70

c) (-50) + (-7x) = 100 - 8x

     -7x + 8x      = 100 + 50

      x                = 150

Bài 1.

a) \(\left(a-b\right)-\left(c-b\right)-a\)

\(=a-b-c+b-a\)

\(=\left(a-a\right)+\left(-b+b\right)-c\)

\(=-c\)

b)\(-\left(300-400\right)+\left(300-400\right)+100\)

\(=-300+400+300-400+100\)

\(=\left(-300+300\right)+\left(400-400\right)+100\)

\(=100\)

Bài 2.

a)\(4x-20=50-\left(30-3x\right)\)

\(\Leftrightarrow4x-20=50-30+3x\)

\(\Leftrightarrow4x-20=20+3x\)

\(\Leftrightarrow x=40\)

Vậy x = 40

b)\(100-\left(-5x\right)=40-\left(-4x+10\right)\)

\(\Leftrightarrow100+5x=40+4x-10\)

\(\Leftrightarrow x=-70\)

Vậy x = -70

c)\(\left(-50\right)+\left(-7x\right)=100-8x\)

\(\Leftrightarrow-50-7x=100-8x\)

\(\Leftrightarrow x=150\)

Vậy x = 150

Linz