\(=100:\left[250-450+4\cdot125-8\cdot25\right]\\ =100:\left[-250+500-200\right]=100:50=2\)

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A+0   B=2400   c=420

alo 

Đáp Án

a)52:4x3+2x52

=13x3+2x52

=39+104

=143

b)5x42-18:32

=100-0.5625

=99.4375

của bạn nha

b: \(1024:2^5+140:\left(38+2^5\right)+2\cdot3^2-7^{23}:7^{21}\)

\(=1024:32+140:\left(38+32\right)+2\cdot9-7^2\)

=32+140:70+18-49

=50-49+2

=1+2

=3

c: \(100:\left\lbrace300:\left\lbrack450-\left(4\cdot5^3-2^3\cdot25\right)\right\rbrack\right\rbrace\)

\(=100:\left\lbrace300:\left\lbrack450-\left(4\cdot125-8\cdot25\right)\right\rbrack\right\rbrace\)

\(=100:\left\lbrace300:\left\lbrack450-\left(500-200\right)\right\rbrack\right\rbrace\)

=100:{300:[450-300]}

=100:{300:150}

=100:2

=50

(600-x)-x=450
600-x-x=450
600-(x+x)=450
600-2x=450
2x=150
x=75

\(\left(600-x\right)-x=450\)

\(\Rightarrow600-x-x=450\)

\(\Rightarrow600-2x=450\)

\(\Rightarrow2x=600-450\)

\(\Rightarrow2x=150\)

\(\Rightarrow x=150:2\)

\(\Rightarrow x=75\)

Học tốt #

x+450=600+180

x+450=780

x=780-450

x=330

x + 450 = 600 + 180

x + 450 = 780

x = 780 - 450

x = 330

\(=600:\left\{450:\left[450-\left(500-200\right)\right]\right\}\)

\(=600:\left\{450:\left[450-300\right]\right\}\)

\(=600:3=200\)

=600:{450:[450-(4.125-8.25)]}

=600:{450:[450-(8.125-4.25)]}

=600:{450:[450-300]

=600:{450:150}

=600:3

=200

Lần sau bn nhớ ghi đúng thứ tự ngoặc nhé