1/ -7264 + (1543 + 7264)
=-7264 + 1543 + 7264=1543
2/ (144 – 97) – 144

=144-97-144=-97

3/ (-145) – (18 – 145)(Vì có dấu trừ ở trước ngoặc nên p đổi dấu)

=-145-18+145=-18

4/ 111 + (-11 + 27)

=111-11+27=137

1/ -7264 + (1543 + 7264)
=-7264 + 1543 + 7264=1543
2/ (144 – 97) – 144
=144-97-144=-97
3/ (-145) – (18 – 145)(Vì có dấu trừ ở trước ngoặc nên p đổi dấu)
=-145-18+145=-18
4/ 111 + (-11 + 27)
=111-11+27=137

Sao giống y chang chương trình của mình vậy :)

2006 x [43 x 10 - 2 x 43 x 5] +100

=2006x0+100

=0+100

=100

64x4+18x4+9x8

=256+72+72

=400

44x5+18x10+20x5

=220+180+100

=500

3x4+4x6+9x2+18

=12+24+18+18

=72

2x5+5x7+9x3

=10+35+27

=72

15:5+27:5+8:5

=[15+27+8]:5

=10

99:5-26:5-14:5

=[99-26-14]:5

=11.8

Câu cuối sai đề nha mà nếu đề như vậy thì đó là toán lớp 6

Cảm ơn bạn I LOVE YOU rất nhiều mình đang vội ,cảm ơn bạn nhé!!!

Trả lời:

\(2006\times\left(43\times10-2\times43\times5\right)+100\)

\(=2006\times\left(43\times10-43\times10\right)+100\)

\(=2006\times0+100\)

\(=0+100\)

\(=100\)

\(44\times5+18\times10+20\times5\)

\(=44\times5+18\times2\times5+20\times5\)

\(=44\times5+36\times5+20\times5\)

\(=5\times\left(44+36+20\right)\)

\(=5\times100\)

\(=500\)

\(3\times4+4\times6+9\times2+18\)

\(=12+24+18+18\)

\(=12+24+36\)

\(=72\)

\(2\times5+5\times7+9\times3\)

\(=5\times\left(2+7\right)+9\times3\)

\(=5\times9+9\times3\)

\(=9\times\left(5+3\right)\)

\(=9\times8\)

\(=72\)

\(15\div5+27\div5+8\div5\)

\(=\left(15+27+8\right)\div5\)

\(=50\div5\)

\(=10\)

\(99\div5-26\div5-14\div5\)

\(=\left(99-26-14\right)\div5\)

\(=59\div5\)

\(=\frac{59}{5}\)

ban tu lam di,luoi the

bai ki vay ,

Bài 1:

a) −x + 8 = −17

−x = −17 − 8

−x = −25

⇒ x = 25

Vậy x = 25

x = −2

c) x − 45 = −17

x = −17 + 45

x = 28

Vậy x = 28

d) |x + 1| = 20 (>0)

TH₁: x + 1 = 20       TH₂: x + 1 = −20

x = 20 − 1                        x       = −20 − 1

x = 19                              x       = −21

Vậy x∈\(\left\{-21;19\right\}\)

e) |x − 3| − 16 = −4

|x − 3| = −4 + 16

|x − 3| = 12 (>0)

TH₁: x − 3 = 12             TH₂: x − 3 = −12

x = 12+3                                x = −12 + 3

x = 15                                    x = −9

Vậy x∈\(\left\{-9;15\right\}\)

b) 35 − x = 37

x = 35 − 37

x = −2

Vậy x = −2

Bài 2: 

a) (144 − 97) − 144

= 144 − 97 − 144
= (144 − 144) − 97
= − 97

b) (−145) − (18 − 145)

= −145 − 18 + 145

= (−145 + 145) − 18

= −18

c) (27 + 514) − (486 − 73)

= 27 + 514 − 486 + 73

= (27 + 73) + (514 − 486)

= 100 + 28

= 128

d) (38 − 29 + 43) − (43 + 38)

= 38 − 29 + 43 − 43 − 38

= (−38 + 38) + (−43 + 43) − 29

= 0 + 0 − 29

= −29

a) 43 x 27 + 43 x 13 + 43 x 68

= 43 x ( 27 + 13 + 68 )

= 43 x 108

= 43 x ( 100 + 8 )

= 43 x 100 + 43 x 8 

= 4300  + 344

= 4644

b) 90 x 21 + 15 x 10 + 30 x 74

= 30 x 63 + 30 x 5 + 30 x 74

= 30 x ( 63 + 5 + 74 )

= 30 x 142

= 30 x ( 100 + 42 )

= 30 x 100 + 30 x 42

= 3000 + 1260

= 4260

a, 43x27+43x13+43x68

=43x(27+13+68)

=43x108

= 4644

b, 90x21+15x10+30x74

=9x10x21+15x10+3x10x74

=10x189+10x15+10x222

=10x(189+222+15)

=10x426

= 4260

Giải

a)43x27+43x13+43x68

=43(27+13+68)

=43x108

=43x100+43x8

=4300+344

=4644

b)90x21+15x10+30x74

=30x63+30x5+30x74

=30(63+5+74)

=30.142

=4260

x - 18 - 42 = 23 - 43 - 70 - x

\(\rightarrow\) 2x = -30

\(\rightarrow\) x = -15

\(\left(-\left(x+15\right)\right)^2\) - 19 = \(3^2\) .5

\(\rightarrow\)\(x^2+30x+225\) - 19 = 45

\(\rightarrow x^2+30x+161=0\)

\(\rightarrow x^2+23x+7x+161=0\)

\(\rightarrow x\left(x+23\right)+7\left(x+23\right)=0\)

\(\rightarrow\left(x+7\right)\left(x+23\right)=0\)

\(\rightarrow\) x = -7 hoặc x = -23

dài quá làm hộ câu 1-5 thoy

1) x=21-13 

    x=8

2)x=-55+41

   x=-14

3)x=-21+15

    x=-6

4)x=3-3

    x=0

5) x= -98-37

   x=-135

15 ) 57 - ( x - 46 ) = - 13

       57 - x + 46 = -13

       103 - x = -13

       x  = 103 + 13

       x  =  116

16 ) -x - 23 = -38 - 42

       - ( x + 23 )=- ( 38 + 42)

            x + 23 = 38 + 42

             x       = 38 + 42 -23

              x      =  57

17 ) x - ( - 7 ) = -4 – 14

      X + 7 = -18

       X = -18-7

        X  = -25

18 ) 18 - x = -8 - ( - 15 )

       18 – x = 7

               X = 18 – 7

                X = 11

19 ) 45 - (  x + 17 ) = - 26

        45 – x - 17  = -26

        28 – x = -26

                X = 28 + 26

                X = 54

20 ) 3. ( x + 5 ) - x - 11 = 24

       3x +15 –x – 11 = 24

       2x + 4 =24

        2x = 24 – 4

        2x = 20

          X = 20 : 2

         X = 10

21 ) 14 - ( x - 7 ) = - 8 - ( - 9 )

       14 – x + 7 = 1

       21 – x = 1

               X = 21 – 1

               X = 20

22 ) 15 - ( x - 2 ) =  - 7 + 8

         15 – x + 2 = 1

            17 – x = 1

                    X = 17 – 1

                    X = 16

6)  x + ( - 71 ) = ( - 55 ) + 85 

      X – 71 = 30

      X = 30 + 71

      X = 101

7 ) x - ( - 45 ) = - 63 + 27

 X +45 = -16

 X = -16 -45

X = - 61

6)  x + ( - 71 ) = ( - 55 ) + 85

X=30+71=101

7 ) x - ( - 45 ) = - 63 + 27

X=-36-45=-81

8) x + 29 = 43 + ( - 23 )

X=20-29=-9

9 ) x + ( - 47 ) = ( - 62 ) – 17

X=-79+47=-32

10 ) x + 21 = ( - 43 ) + 43

X=0-21=-21

11 ) 31 + x = 45 – 81

 X=-36-31=-67

12 ) x - 12 = ( - 8 ) + (- 7 )

 X=-15+12=-3

13 ) 23 - x = 24 - ( - 16 )

X=23-40=-17

14 ) - 15 - ( - 21 - 3x ) = - 63 -15+21+3x=-63 21+3x=-63-(-15)

 21+3x=-48

3x=-48-21

3x=-69

X=-69 : 3

X=-23

1: \(=75\left(27+25-2\right)=75\cdot50=3750\)

2: \(=15\left(23+37\right)+55=15\cdot60+55=955\)

3: \(=36\cdot14+36\cdot17+36\cdot69\)

\(=36\cdot100=3600\)

4: \(=200\cdot\left(32+68\right)=200\cdot100=20000\)