149 x 30,134 - 47 x 35,081 + 149 x 16,866 - 13,919 x 47=4700

d

14900

106

\(a,149\times\left(75+23+1+1\right)=149\times100=14900\)

\(b,13,25:\left(0,5+0,25+0,025\right)=\dfrac{53}{4}\times\dfrac{40}{31}=\dfrac{530}{31}\)

14900,106

a) 96. ( -21 ) + ( -142 ) . 48

=( -2016 ) + ( - 6816 )

= -8832

​b) -199 + 52 . ( -149 ) + ( -149 ) . 47

= -199 + ( -149 ) . ( 52 + 47 )

​= -199 + ( -149 ) . 99

​= -199 + ( - 14751 )

= -14552

a, 96. ( -21) + ( -142 ) .48

= 48 . (-42) + (-142) .48 

= 48.[(-42) + (-142)] = 48 .(-182) = 8736

b, -199 + 52.(-149)+(-149).47

= (-50) + (-149) +  52.(-149)+(-149).47

= (-50) + (-149)( 1+ 52 + 47 )

= (-50) + (-149).100 

= (-50) + (-14900) 

= -14950

-8832

-14552

tich nha

X x 8 = 149 - 53

X x 8 = 96

X = 96 : 8

X = 12

x có 2 trường hợp

a) 3+\(\left|x+7\right|\) =4

\(\left|x+7\right|\) =4-3

\(\left|x+7\right|\) =1

\(\Rightarrow\)x+7=1 hoặc x+7 =-1

✽ x+7=1 \(\Rightarrow\)x=-6

✽x+7 =-1\(\Rightarrow\)x=-8

Vậy x=-6, x=-8

b) 12-\(\left|x+8\right|\)= 10

\(\left|x+8\right|\) = 12- 10

\(\left|x+8\right|\) = 2

\(\Rightarrow\) x+8 = 2 hoặc x+8 = -2

✽ x+8= 2 \(\Rightarrow\)x=6

✽x+8 = -2 \(\Rightarrow\)x=-10

A) 149 - ( 2x - 53 ) = 54

2x - 53 = 149 - 54

2x - 53 = 95

2x = 95 + 53

2x = 148

x = 148 : 2

x = 74

B) 47 - 3( 2x - 18 ) = 35

3( 2x - 18 ) = 47 - 35

3( 2x - 18 ) = 12

2x - 18 = 12 : 3

2x - 18 = 4

2x = 4 + 18

2x = 22

x = 22 : 2

x = 11

C) 2x - 105 : 21 = 15

2x - 5 = 15

2x = 15 + 5

2x = 20

x = 20 : 2

x = 10

D) ( 2x - 105 ) : 21 = 15

2x - 105 = 15 x 21

2x - 105 = 315

2x = 315 + 105

2x = 420

x = 420 : 2

x = 210

2x-53=149-54

2x-53=95

2x       =95+53

2x         =148

x          =148:2

x               =74

Thanks các bạn nhé😊😊😊😊😊😊😊😊

a) => 12925 : x = 3522 - 3247

12925 : x = 275

x = 12925 : 275

x = 47

b) => 17658 : x = 149 + 178

17658 : x = 327

x = 17658 : 327

x = 54