A)-4100
B)944
C)0
D)1007
E)-87
F)-45

Bùi Anh Tuấn xuất sắc quá

1.a) 168 - 300 : 15

= 168 - 20 = 148

b) 103 - 13 = 90

2. 87 - (321 - x) = 75 : 5 = 15

321 - x = 87 - 15

321 - x = 72

x = 321 - 72 = 249

a)

\(\frac{864\cdot48-432\cdot96}{864\cdot48\cdot432}=\frac{432\cdot2\cdot48-432\cdot96}{864\cdot48\cdot432}=\frac{432\cdot96-432\cdot96}{864\cdot48\cdot432}=\frac{0}{864\cdot48\cdot432}=0\)

Làm từng phần một nha =))

b)

\(\frac{16\cdot17-5}{16\cdot16+11}=\frac{16\cdot\left(16+1\right)-5}{16\cdot16+11}=\frac{16^2+16-5}{16^2+11}=\frac{16^2+11}{16^2+11}=1\)

@_@

\(e,112-45+5x=87\)

\(67+5x=87\)

\(5x=20\)

\(x=4\)

\(f,6^2+64:\left(x-1\right)=52\)

\(36+64:\left(x+1\right)=52\)

\(64:\left(x+1\right)=16\)

\(x+1=4\)

\(x=3\)

\(g,\left(55-x\right)\left(2x-44\right)=0\)

\(\Rightarrow\hept{\begin{cases}55-x=0\\2x-44=0\end{cases}}\)

\(\Rightarrow\hept{\begin{cases}x=55\\x=22\end{cases}}\)

Vậy ....

\(h,x^2+4=13\)

\(x^2=9\)

\(x^2=\pm3^2\)

\(\Rightarrow x=\pm3\)

B4

a)x=10

b)x=3

c)x=11

d)x=8

1.

a. 

11 + x : 5 = 13 

x : 5 = 13 - 11

x : 5 = 2

x      = 2 . 5

x      = 10

a. 4.37.25.50.12

  =(4.25).(50.12).37

  =100.600.37

  =2220000

\(a.\left(4.50\right).\left(25.12\right).37\)

\(=200.300.37=2220000\)

\(b.\left(46+54\right)+\left(17+83\right)\)

\(=100+100=200\)

\(c.87.\left(36+69\right)=87.105=9135\)

\(d.\left(135+65\right)+\left(360+40\right)\)

\(=200+400=600\)

\(e.\left(463+137\right)+\left(318+22\right)\)

\(=600+340=940\)

a)\(=\frac{45\cdot\left(15+1\right)-17}{45\cdot15+28}\)

\(=\frac{45\cdot15+45-17}{45\cdot15+28}\)

\(=\frac{45\cdot15+28}{45\cdot15+28}\)

=1

b)=>(x+1)[(x-1):3+1]:2=330

=>(x+1)[(x-1):3+1]=660

=>(x+1)[(x-1):3+1]=44.15

=>x+1=44

=>x=43

= ( -25) x 1 +72 x (-25) + (-25) x27

= (- 25) x ( 1 + 72 + 27 )

= (-25) x 100

=-2500 

b 

c 37 x ( 25 + 37 ) - 27 x ( 37 + 25 )

= 37 x 25 + 37 x 37 -27x37 -27x25

= ( 37 x25 -27x25 )+(37x37-27+37)

=25 x ( 37 -27 ) + 37 x (37 - 27)

= 25 x10 + 37x10 

= 250 + 370 

= 770