a, 53.(-15)+(-15).47

=(-15)(53+47)

=(-15).100

=-1500

b, 43.(53-81)+53.(81-43)

=43.(-28)+53.38

=810

c,(-5).8+53.(81-43)

=-45+53.38

=1969

d, ban tu giai nốt

a,-15 . (53+47)

 = -15 . 100

=-1500

b,43.53-43.81+53.81-43.53

=(43.53-43.53)+81.(-43+53)

= 0 + 81.10

=0+810

=810

c,-40+-8

=-48

d,3.16+(-10)-20

=48+(-10)-20

=38-20

=18

a) 53 . (-15) + (-15) . 47

= (53 + 47) . (-15)

= 100 . (-15) 

= -1500

b) 43 . (53 - 81) + 53 . (81 - 43)

= 43 . (-28) + 53 . 38

= -1204 + 2014

= 810

c) (-5) . 8 + (-2) . 3

= (-5) . (-2) . (-4) + (-2) . 3

= 20 . (-2) + (-2) . 3

= (20 + 3) . (-2)

= -46

d) 3 . (-4)² + 2 . (-5) - 20

=  3.16 + (-10) - 20

= 18

k cho tớ nha bn

  43.(53-81) + 53.(81-43)

= 43.(-38) + 53.38

= -43.38 + 53.38

= 38.(-43 + 53)

= 38.10

= 380

43.(53-81) +53.(81-43)

= 43.(-28)+53.38

= -1204+2014

= 810

a) \(3.5^2+15.2^2-26\div2\)

= 3.25 + 15.4 - 13

= 75 + 60 - 13

= 135 - 13

= 122

b) \(5^3.2-100\div4+2^3.5\)

= 125.2 - 25 + 8.5

= 250 - 25 + 40

= 225 + 40

= 265

c)\(6^2\div9+50.2-3^3.33\)

= 36 : 9 + 100 - 9.33

= 4 + 100 - 297

= 104 - 297

= -193

d)\(3^2.5+2^3.10-81\div3\)

= 9.5 + 8.10 - 27

= 45 + 80 - 27

= 125 - 27

= 98

e) \(5^{13}\div5^{10}-25.2^2\)

= 5³ - 25.4

= 125 - 100

= 25

f) \(20\div2^2+5^9\div5^8\)

= 20 : 4 + 5

= 5 + 5

= 10

Đăng lần lượt nhiều nhất 3 câu hỏi thôi, chứ đăng nhiều vậy, thấy nhát làm lắm. 

a, 17 * ( 53 - 43 ) + 43 * ( 53 + 17 )

= 17 x 10 +43 x 70

= 170 + 3010

= 3180

Tính nhanh:

   912 + [88 + (-453) + (-547)]

= 912 + 88 - 453 - 547

= (912 + 88) - (453 + 547)

= 1000 - 1000

= 0

Thực hiện các phép tính sau:

6-8 = 6 + (-8) = -2

3-(-9) = 3 + 9 = 12

(-5)-10 = (-5) + (-10) = -15

0-7 = -7

4-0 = 4

(-2)-(-10) = (-2) + 10 = 8

Tính:

-2+(-6)+7- 3 = -4

-5-7-3+7 = -8

(-6)-4+5-7+12 = 0

2-(-8)+10-30 = -10

Bỏ dấu ngoặc rồi tính:

a) (4+32+6)+(10-36-6)

= 4 + 32 + 6 + 10 - 36 - 6

= (4 + 32 - 36) + (6 - 6) + 10

= 0 + 0 + 10

= 10

b) (77+22+-65)-(67+12-75)

= 77 + 22 - 65 - 67 - 12 + 75

= (77 - 67) + (22 - 12) - (65 - 75)

= 10 + 10 - (-10)

= 30

c)-(-21+43+7)-(11-53-17).

= 21 - 43 - 7 - 11 + 53 + 17

= (21 - 11) - (43 - 53) - (7 - 17)

= 10 - (-10) - (-10)

= 30

Tham khảo nha!!!

Bài 2:

\(a)125+\left[-17+20+\left(-125\right)\right]\)

\(=125+\left(-17\right)+20+\left(-125\right)\)

\(=\left[125+\left(-125\right)\right]+\left[\left(-17\right)+20\right]\)

\(=0+3=3\)

\(b)43.\left(53-81\right)+53\left(81-43\right)\)

\(=43.53-81.43+53.81-43.53\)

\(=\left(43.53-43.53\right)-\left(81.43-53.81\right)\)

\(=0-81\left(43-53\right)\)

\(=0-81.\left(-10\right)=0-\left(-810\right)=810\)

\(c)\dfrac{-69}{-47}-\dfrac{31}{47}\)\(=\dfrac{69-31}{47}=\dfrac{38}{47}\)

Bài 3:

\(a)13-\left|x\right|+15=20\)

\(\Leftrightarrow13-\left|x\right|=5\)

\(\Leftrightarrow\left|x\right|=8\)

\(\Leftrightarrow x\in\left\{-8;8\right\}\)

\(b)3x-15=25-5x\)

\(\Leftrightarrow3x+5x=25+15\)

\(\Leftrightarrow8x=40\)

\(\Leftrightarrow x=5\)

\(c)2x-17=-\left(3x-18\right)\)

\(\Leftrightarrow2x-17=-3x+18\)

\(\Leftrightarrow2x+3x=17+18\)

\(\Leftrightarrow5x=35\)

\(\Leftrightarrow x=7\)

\(P/S:\) Bạn tự kết luận.

Bài 1: Tính

\(a)127-8.\left(5+6\right)\)

\(=127-8.11\)

\(=127-88=39\)

\(b)26-7\left(4-12\right)\)

\(=26-7.\left(-8\right)\)

\(=26-\left(-56\right)=26+56=82\)

\(c)-69.\left(-47\right)-31.\left(47\right)\)

\(=-68.\left(-47\right)-31.\left(-1\right)\left(-47\right)\)

\(=-47\left[-69-\left(-31\right)\right]\)

\(=-47.100=-4700\)

\(d)35:\left(-5\right)-7.\left(5-18\right)\)

\(=-7-\left(-7\right).7\)

\(=-7-\left(-49\right)=42\)

a, (-72).(15 - 49) + 15.(-56 + 72)

= -72 . 15 + 72.49  - 15.56 + 15.72

= (-72.15 + 15.72) + (72.49  - 15.56)

= 3528 - 84

= 2688

1b, 1532 + (-186) + (-1432) + (-14) + 123

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

= 100 - 200 + 123

= 223 - 200

= 23 

43.(53 - 81) + 53.(81 - 43)

= 43.53 - 81.43 + 53.81 - 53.43

= (43.53 - 53.43) + (81.53 - 81.43)

= 0 + 81.(53-43)

= 81.10

= 810