\(6,7:\left(0,2-0,5+0,25+3\right)=64,9\)

6,7:(0,2-0,5+0,25+3)

=64,9

a+b-50+100000=900000000

6,7 kg + 6,7kg + 6,7kg x7
= 6,7kg x 9
= 60,3kg

6,7 kg + 6,7 kg + 6,7 kg x 7

= 6,7 kg + 3 x 7

= 6,7 kg x ( 3 + 7 )

= 6,7 kg x 10

= 67 kg

tick cho mình nhé!

\(5,3\times6,7+\times6,7\times4,6+6,7:10\\ =5,3\times6,7+6,7\times4,6+\times6,7:\dfrac{10}{1}\\ =\times5,3\times6,7+6,7\times4,6+6,7\times\dfrac{1}{10}\\ =5,3\times6,7+6,7\times4,6\times+6,7\times0,1\\ =6,7\times\left(5,3+4,6+0,1\right)\\ =6,7\times10\\ =67\)

a: |2x|=x-4

TH1: x>=0

=>2x=x-4

=>x=-4(loại)

TH2: x<0

=>-2x=x-4

=>-3x=-4

=>x=4/3(loại)

b: 7-|2x+1|=x

=>|2x+1|=7-x

TH1: x>=-1/2

=>2x+1=7-x

=>3x=6

=>x=2(nhận)

TH2: x<-1/2

=>2x+1=x-7

=>x=-8(nhận)

\(\left|2x\right|=x-4\)

\(TH_1:x\ge0\\ 2x=x-4\Leftrightarrow2x-x=-4\Leftrightarrow x=-4\left(ktm\right)\)

\(TH_2:x< 0\\\Leftrightarrow-2x=x-4\Leftrightarrow-2x-x=-4\Leftrightarrow-3x=-4\Leftrightarrow x=\dfrac{4}{3}\left(ktm\right) \)

Vậy pt vô nghiệm.

\(7-\left|2x+1\right|=x\\ \Leftrightarrow\left|2x+1\right|=7-x\)

\(TH_1:x\ge-\dfrac{1}{2}\)

\(2x+1=7-x\Leftrightarrow2x+x=7-1\Leftrightarrow3x=6\Leftrightarrow x=2\left(tm\right)\)

\(TH_2:x< -\dfrac{1}{2}\\ -2x-1=7-x\Leftrightarrow-2x+x=7+1\Leftrightarrow-x=8\Leftrightarrow x=-8\left(tm\right)\)

Vậy \(S=\left\{-8;2\right\}\)

57,98;     3,87;     0,67

8,0513

0,6719

0,035

6,7 x 9,8 + 0,1 x 6,7 + 0,67

= 6,7 x 9,8 + 0,1 x 6,7 + 6,7 : 10

= 6,7 x 9,8 + 0,1 x 6,7 + 6,7 x 0,1

= 6,7 x (9,8 + 0,1 + 0,1)

= 6,7 x 10

= 67

bằng 67 nhé