a ; 29 x 64 +116 x 34 

= 29  x 2 x 32 + 116 : 2 x 2 x 34 

= 58 x 32 + 58 x 68 

= 58 ( 32 + 68)

= 58 x 100 

= 5800

b, 136 x 68 + 16 x 272 

=  136 x 68 + 16 x 2 x 136

= 136 x 68 + 136 x 32

= 136 ( 68 + 32)

= 136 x 100

= 13600

d) => x-280 = 54:35=54/35

=> x = 54/35 +280=9854/35

g) x-8 = 54

=> x = 54+8 = 66

e)  x-6 = 72 .4 :12=24

=> x = 24+6=30

tự làm đi

(x-280):35= 56:5=56/5

x-280=56/5.35=392

x=392+280=672

( x - 280 ) : 35 = 56 : 5

( x - 280 ) : 35 = 11.2

x - 280 = 11.2 x 35

x - 280 = 392

x = 392 + 280

x = 672

(x-280):35=11
x-280       =35x11
x-280       =385
x              =385+280
x               =665

ai trả lời giúp mik với

a) x = 278.           

b) x = 295.          

c) x = 100.           

d) x = 180.

a) x = 278.

b) x = 295.

c) x = 100.

d) x = 180

dài quá ko làm nha!!!

1)\(\left(x-280\right):35=56.5\)

\(\left(x-280\right):35=280\)

\(x-280=280.35\)

\(x-280=9800\)

\(x=9800+280\)

\(x=10080\)

2) \(\left(x-128+20\right):192=0\)

\(\Rightarrow\left(x-148\right):192=0\)

\(\Rightarrow x-148=0\)

\(\Rightarrow x=0+148\)

\(\Rightarrow x=148\)

3) \(460+85.4=\left(x+200\right).4\)

\(\Rightarrow\left(x+200\right).4=460+340\)

\(\Rightarrow\left(x+200\right).4=800\)

\(\Rightarrow x+200=800:4=200\)

\(\Rightarrow x+200=200\)

\(\Rightarrow x=200-200=0\)

4) \(x+5.2-\left(32+16.3:16-15\right)=0\)

\(\Rightarrow x+10-\left(32+3-15\right)=0\)

\(\Rightarrow x+10-20=0\)

\(\Rightarrow x+10=20\)

\(\Rightarrow x=20-10=10\)

nha m.n