hình như là 60

60 bạn nhé

60 nha bạn 

\(x:3\times48+x:4\times36=1500\)

\(x\times\frac{1}{3}\times48+x\times\frac{1}{4}\times36=1500\)

\(x\times16+x\times9=1500\)

\(x\times\left(16+9\right)=1500\)

           \(x\times25=1500\)

                      \(x=1500:25\)

                       \(x=60\)

1/3 và 1/4 ởđâu ra

\(x\div3\times4,5+x\div4\times34=1500\)

\(x\div13,5+x\div136=1500\)

\(x\div\left(13,5+0,1\right)+x\div136=1500\)

\(x\div13,6+x\div136=1500\)

\(x\div\left(136\div13,6\right)=1500\)

\(x\div10=1500\)

\(\Rightarrow x=1500\div10=150\)

0,1 lấy đâu ra vậy

\(\left\{{}\begin{matrix}x+y=1500\\x+\dfrac{75}{100}x+y+\dfrac{68}{100}y=2583\end{matrix}\right.\\ \Leftrightarrow\left\{{}\begin{matrix}x+y=1500\\\left(x+y\right)+\dfrac{3}{4}x+\dfrac{17}{25}y=2583\end{matrix}\right.\\ \Leftrightarrow\left\{{}\begin{matrix}x+y=1500\\1500+\dfrac{3}{4}x+\dfrac{17}{25}y=2583\end{matrix}\right.\\ \Leftrightarrow\left\{{}\begin{matrix}x+y=1500\\\dfrac{3}{4}x+\dfrac{17}{25}y=1083\end{matrix}\right.\\ \Leftrightarrow\left\{{}\begin{matrix}x=900\\y=600\end{matrix}\right.\)

   225 x 96 + 4 x 225 - 1500

= 225 x (96 + 4) - 1500

= 22500 - 1500

= 21000

225x96+4x225-1500=225x(96+4)-1500

=225x100-1500

=22500-1500

=21000

` @L I N H `

 225 x 96 + 4 x 225 - 1500

= 225 x (96 + 4) - 1500

= 22500 - 1500

= 21000

giúp mik nhé cám ơn

16

=28

b. 1500(x-7)=0

x-7=0

x=7

c. (2x-4)(48-12x)=0

2x-4=0 hoặc 48-12x=0

x=2 hoặc x=4

d. (x+12)(x-1)=0

x+12=0 hoặc x-1=0

x=-12 hoặc x=1

bài 2 :

a . 128-3(x+4)=23

3(x+4)=105

x+4=35

x=31

b. [(14X+26).3+55]:5=35

(14x+26).3+55=175

(14x+26).3=120

14x+26=40

14x=14

x=1

d. 720:[41-(2X-5)]=23.5

41-(2x-5)=720:(23.5)

41-(2x-5)=144/23

2x-5=799/23

2x=914/23

x=457/23

b, 1500.(x – 7) = 0

<=>1500x-10500=0

<=>1500x=10500

<=>x=7

Vậy x=7

c,(2.x – 4).(48 – 12.x) = 0

\(\Leftrightarrow\)\(\left\{{}\begin{matrix}2x-4=0\\48-12x=0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}2x=4\\12x=48\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=2\\x=4\end{matrix}\right.\)

Vậy x=2 hoặc x=4

d, (x + 12).(x – 1) =0

\(\Leftrightarrow\left\{{}\begin{matrix}x+12=0\\x-1=0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=-12\\x=1\end{matrix}\right.\)

Vậy x=-12 hoặc x=1

Bài 2:

a) 128- 3(x+ 4) = 23

\(\Leftrightarrow\)128-(3x+12)=23

\(\Leftrightarrow\)128-3x-12=23

\(\Leftrightarrow\)116-3x=23

\(\Leftrightarrow\)3x=116-23

\(\Leftrightarrow\)3x=93

\(\Leftrightarrow\)x=31

Vậy x=31

b) [(14x+ 26). 3+ 55]: 5= 35

\(\Leftrightarrow\)(14x+ 26). 3+ 55=175

\(\Leftrightarrow\)42x+78+55=175

\(\Leftrightarrow\)42x+133=175

\(\Leftrightarrow\)42x=175-133

\(\Leftrightarrow\)42x=42

\(\Leftrightarrow\)x=1

Vậy x=1

d, 720: [41- (2x- 5)]= 23. 5

\(\Leftrightarrow\)720: 41- (2x- 5)=115

\(\Leftrightarrow\)41-(2x- 5)=720:115

\(\Leftrightarrow\)41-(2x- 5)=\(\dfrac{144}{23}\)

\(\Leftrightarrow\)2x-5=\(\dfrac{799}{23}\)

\(\Leftrightarrow\)2x=\(\dfrac{914}{23}\)

\(\Leftrightarrow\)x=\(\dfrac{457}{23}\)

Vậy x=\(\dfrac{457}{23}\)

756 = 700 + 50 + 6 hoặc 7 x 100 + 5 x 10 + 6 x 1

862 = 8 x 100 + 6 x 10 + 2

HT

a) 756 = 700 + 50 + 6 = 7 x 100 + 5 x 10 + 6

b) 862 = 8 x 100 + 6 x 10 + 2

c) 4 x 2 + 4 x 5 + 4 = 4 x (2 + 5 + 1) = 4 x 8 = 32

d) a x 7 + a x 2 + a = a x (7 + 2 + 1) = a x 10 = a0

e) abc = a x 100 + b x 10 + c

Chúc bạn học tốt.

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