1532+(-186)+(-1432)-14+123

=1532+(-186)+(-1432)+(-14)+123

=[(-186)+(-14)]+[1532+(-1432)]+123

=    (-200)       +     100          +123

=             (-100)          +        123

=                          23

nhớ tick cho mình nhé các bạn

Câu 1 :

a) 1532 + ( - 186 ) + ( - 1432 ) - 14 + 123

= 1532 - 186 - 1432 - 14 + 123

= ( 1532 - 1432 ) - ( 186 + 14 ) + 123

= 100 - 200 + 123

= -100 + 123

= -23.

b) -47.69 + 31.(-47)

= -47 . ( 69 + 31 )

= -47 . 100 = -4700

Câu 2 

a) x + 10 = -14

x = -14-10 = -24

b ) 5x-12=48

5x = 48+12=60

x=60:5=12

Câu 1:

a) 1532 +(-186) +(-1432)-14+123

  =1532+(-1432)+[(-186)-14]+123

  = 100  +  (-200)  +123

  =23

b)-47.69 +31.(-47)

  =-47(69+31)

  = -47.100

  =-4700

Câu 2:

a) x+10=-14

         x=-14-10

         x=-24

b)5x-12=48

        5x=48+12

        5x=60

          x=60:5

          x=12

Tick cho mình nha bạn!

a) 180

b) 90

c)  2887

d) 51

k nhá

d)  |31-17| - |15-52|

= |14| - |-37|

= 14 - 37

= -23

b ) 136 -(-7) +6- 23 -36

= 136 + 7 + 6 - 23 - 36

= 143 + 6 - 23 - 36

= 149 - 23 - 36

= 90

\(=47.69-31.47.\left(-1\right)\\ =47.\left(69+31\right)\\ =47.100=4700\)

\(47\cdot69-31\cdot(-47)\\=47\cdot69-31\cdot(-1)\cdot47\\=47\cdot69+31\cdot47\\=47\cdot(69+31)\\=47\cdot100\\=4700\)

=47.69−31.47.(−1)

=47.(69+31)

=47.100

=4700

Tick mik nha :D

\(xy+14+2y+7x=-10\)

\(\Rightarrow xy+7x+7y=-24\)

\(\Rightarrow x\left(y+7\right)+7y=-24\)

\(\Rightarrow x\left(y+7\right)+7y+49=-24+49\)

\(\Rightarrow x\left(y+7\right)+7\left(y+7\right)=25\)

\(\Rightarrow\left(x+7\right)\left(y+7\right)=25\)

\(\Rightarrow\left(x+7\right);\left(y+7\right)\inƯ\left(25\right)=\left\{\pm1;\pm5;\pm25\right\}\)

Xét bảng 

Vậy.........................

\(xy+x+y=2\)

\(\Rightarrow x\left(y+1\right)+\left(y+1\right)=2+1\)

\(\Rightarrow\left(x+1\right)\left(y+1\right)=3\)

\(\Rightarrow\left(x+1\right);\left(y+1\right)\inƯ\left(3\right)=\left\{\pm1;\pm3\right\}\)

Xét bảng 

Vậy.....................................

\(xy-10+5x-3y=2\)

\(\Rightarrow xy-5x-3y=12\)

\(\Rightarrow x\left(y-5\right)-3y+15=12+15\)

\(\Rightarrow x\left(y-5\right)-3\left(y-5\right)=27\)

\(\Rightarrow\left(x-3\right)\left(y-5\right)=27\)

\(\Rightarrow\left(x-3\right);\left(y-5\right)\inƯ\left(27\right)=\left\{\pm1;\pm3;\pm9;\pm27\right\}\)

Tự xét bảng như trên 

\(xy-1=3x+5y+4\)

\(\Rightarrow xy-3x-5y=4+1\)

\(\Rightarrow x\left(y-3\right)-5y+15=1+4+15\)

\(\Rightarrow x\left(y-3\right)-5\left(y-3\right)=20\)

\(\Rightarrow\left(x-5\right)\left(y-3\right)=20\)

\(\Rightarrow\left(x-5\right)\left(y-3\right)\inƯ\left(20\right)=\left\{\pm1;\pm2;\pm4;\pm5;\pm10;\pm20\right\}\)

Xét bảng 

Vậy......................................

bn nhấn vào đúng 0 sẽ ra đáp án

1,tính

23

24

-185

2, 

x+ 1 là số nguyên âm lớn nhất

=> x+1= (-1)

 x = (-1)-1

x= ( -2)

bài 1 dễ tự làm nhé

bài 2: x= -2

-47 . 69 + 31 . ( -47 ) - ( -155 ) + 5 . ( -3²)

= -47. ( 69 + 31 ) +155 + 5. ( -9 )

= -47 . 100 + 155 -45

= -4700 + 155 + -45

= -4950

-47.69+31.(-47)-(-155)+5.(3²)

=-47.(69+31)-(-155)+5.9

=47.100-(-155)+45

=4700-(-110)

=4810