Lời giải:

1. $=12,5\times 5+12,5\times 4+12,5$

$=12,5\times (5+4+1)=12,5\times 10=125$

2. 

$=(0,4\times 0,25)\times (2\times 50)$

$=0,1\times 100=10$

Đề bài:25x2+50+50:0.25+50:0.5+50:0.125+50:0.25

=50+50+50x4+50x2+50x8+50x4

=50x(1+1+4+2+8+4)

=50x20

=1000
 

1000 (nha)

Ai k mình mình k lại cho

\(x+50\%=0,25+\dfrac{1}{2}\)

\(x+\dfrac{1}{2}=\dfrac{1}{4}+\dfrac{1}{2}\)

\(x=\dfrac{1}{4}+\dfrac{1}{2}+\dfrac{-1}{2}\)

\(x=\dfrac{1}{4}\)

Vậy x = \(\dfrac{1}{4}\)

\(x+50\%=0,25+\dfrac{1}{2}\)

\(x+\dfrac{1}{2}=\dfrac{1}{4}+\dfrac{1}{2}\)

\(x=\dfrac{1}{4}\)

\(x+50\%=0,25+\dfrac{1}{2}\)

\(x+\dfrac{1}{2}=\dfrac{1}{4}+\dfrac{1}{2}\)

\(x=\dfrac{1}{4}+\dfrac{1}{2}+\dfrac{-1}{2}\)

\(x=\dfrac{1}{4}\)

Vậy\(x=\) \(\dfrac{1}{4}\)

a: Ta có: \(\left(x\times0,25+2012\right)\times2013=\left(50+2012\right)\times2013\)

=>\(x\times0,25+2012=50+2012\)

=>\(x\times0,25=50\)

=>x=50:0,25=50x4=200

b: \(x:0,25+x\times6=40\)

=>\(x\times4+x\times6=40\)

=>\(x\times\left(4+6\right)=40\)

=>10x=40

=>x=4

  \(38:0,5+2\) x \(12:4\) x \(100-50:0,25\)

\(=76+24:400-200\)

\(=\left(76+24\right):\left(400-200\right)\)

\(=100:200\) \(=\dfrac{1}{2}\)

= 1/2 x a + 3/4 x a - 1/2 x a

= ( 1/2 + 3/4 - 1/2 ) x a

= 3/4 x a

= 3 x a/ 4

ủa sai đề bài à

=50%.x+x:0.25

=1/2.x+x.4

=4,5x

a)bằng 51,1

b)bằng 900

nha

a = 5373

b=4363

nha

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