19: \(\left(-17\right)+7-10\)

\(=\left(-17+7\right)-10\)

=-10-10

=-20

20: \(\left(-18\right)+10+8\)

\(=\left(-18\right)+\left(10+8\right)\)

=-18+18

=0

21: \(\left(-20\right)+15+5\)

\(=\left(-20\right)+\left(15+5\right)\)

=-20+20

=0

22: \(\left(-16\right)+8+8\)

\(=\left(-16\right)+\left(8+8\right)\)

=-16+16

=0

23: \(\left(-6\right)+3-3\)

\(=\left(-6\right)+\left(3-3\right)\)

=-6+0

=-6

24: \(13+3-16\)

\(=\left(13+3\right)-16\)

=16-16

=0

A, =47.(-1).12+12.(-53)

    =(-47).12+12.(-53)

     =[(-47)+(-53)].12

    =-100.12

    =-1200

Thực hiện phép tính (tính nhanh nếu có thể)

a, 47.(-12) + 12. (-53)

=(-47).12+12.(-53)

=12.[-47+(-53)]

=12.(-100)

=-1200

b, 106. (-3 - 105) - 106.(-105)

=106.[-3-105-(-105)]

=106.(-3)

=-318

-4/11+5/6+7/11-5/6

=(-4/11+7/11)+(5/6-5/6)

=3/11+0

=3/11

Làm là giúp đủ 3 câu hộ mình. 1 câu k k đâu !

a)1125-374-1125-65+374

=(1125-1125)+(-374+374)-65

=0+0-65

=-65

a/ 1125-(374+1125)+(-65+374)

=1125-374+1125+(-65)+374

=[1125+1125]+[-374+374]+(-65)

=2250+0+(-65)

=2250+(-65)

=2185

b/ -23.63+23.21-58.23

=-23.(63+23-58)

=-23.28

=-644

1: \(347\cdot2^2-2^2\cdot\left(216+184\right):8\)

\(=347\cdot4-4\cdot400:8\)

\(=347\cdot4-4\cdot50=4\cdot\left(347-50\right)=4\cdot297=1188\)

2: \(132-\left\lbrack116-\left(132-128\right)^2\right\rbrack\)

\(=132-\left\lbrack116-4^2\right\rbrack\)

=132-(116-16)

=132-100

=32

3: \(16:\left\lbrace400:\left\lbrack200-\left(37+46\cdot3\right)\right\rbrack\right\rbrace\)

=16:{400:[200-(37+138)]}

=16:{400:[200-175]}

=16:{400:25}

=16:16

=1

4: \(\left\lbrace184:\left\lbrack96-124:31\right\rbrack-2\right\rbrace\cdot3651\)

\(=\left\lbrace\frac{184}{96-4}-2\right\rbrace\cdot3651\)

=(184:92-2)*3651

=0

5: \(46-\left\lbrack\left(16+71\cdot4\right):15\right\rbrack-2\)

=46-[(16+284):15]-2

=46-300:15-2

=46-20-2

=46-22

=24

6: \(3^3\cdot18+72\cdot4^2-41\cdot18\)

\(=18\left(3^3-41\right)+72\cdot16\)

\(=18\cdot\left(27-41\right)+18\cdot64\)

=18(-14+64)

=18*50

=900

7: \(\left(56\cdot46-25\cdot23\right):23\)

\(=56\cdot\frac{46}{23}-25\)

=112-25

=87

8: \(\left(28\cdot54+56\cdot36\right):21:2\)

\(=18\cdot28\left(3+2\cdot2\right):42\)

\(=18\cdot\frac{28}{42}\cdot7=18\cdot\frac23\cdot7=12\cdot7=84\)

9: \(\left(76\cdot34-19\cdot64\right):\left(38\cdot9\right)\)

\(=\frac{19\cdot\left(4\cdot34-64\right)}{38\cdot9}=\frac{4\cdot34-64}{9\cdot2}=\frac{4\cdot\left(34-16\right)}{18}=4\)

10: \(\left(2+4+6+\cdots+100\right)\cdot\left(36\cdot333-108\cdot111\right)\)

\(=\left(2+4+6+\cdots+100\right)\cdot36\cdot111\left(3-3\right)\)

=0

11: \(\left(5\cdot4^{11}-3\cdot16^5\right):4^{10}\)

\(=\left(5\cdot4^{11}-3\cdot4^{10}\right):4^{10}\)

\(=5\cdot\frac{4^{11}}{4^{10}}-3\cdot\frac{4^{10}}{4^{10}}\)

=20-3

=17

12: \(\frac{7256\cdot4375-725}{3650+4375\cdot7255}=\frac{7255\cdot4375+4375-725}{7255\cdot4375+3650}\)

\(=\frac{7255\cdot4375+3650}{7255\cdot4375+3650}\)

=1

(128-97+34)-(34-97+228)+2021^1

=(31+34)-[(-63)+228]+1

=65-165+1

=(-100)+1

=-99

mik gửi bạn lời giải , chúc bạn học tốt nhóe ! 

1: \(\left(-5\right)+8-7=8+\left(-5-7\right)\)

=-12+8

=-4

2: \(\left(-8\right)+2+8=\left(-8+8\right)+2=0+2=2\)

3: \(\left(-1\right)+3+1\)

\(=\left(-1+1\right)+3\)

=0+3

=3

4: \(\left(-6\right)+8-14\)

\(=\left(-6-14\right)+8\)

=-20+8

=-12

5: \(\left(-4\right)+3-7\)

\(=\left(-4-7\right)+3\)

=-11+3

=-8

6: \(\left(-4\right)+5-2\)

\(=\left(-4-2\right)+5\)

=-6+5

=-1