1: =-3x5+2x5-7x5+7x4=-8x5+7x4=-40+28=-12

2: =-3x5+3x6-4x3+4x2=-9+8=-1

3: =17(-84-16)=-1700

4: =1975(-115+15)=-197500

5: =-145x13+145x57+57x10-57x145=-1315

1/ \(5\left(-3+2\right)-7\left(5-4\right)\)

\(=5.\left(-3\right)+5.2-7.5-7.\left(-4\right)\)

\(=-15+10-35+28\)

\(=-5-7\)

\(=-12\)

2/ \(3.\left(-5+6\right)-4.\left(3-2\right)\)

\(=3.\left(-5\right)+3.6-4.3-4.\left(-2\right)\)

\(=-15+18-12+8\)

\(=3-4\)

\(=-1\)

3/ \(17.\left(-84\right)+17.\left(-16\right)\)

\(=17.\left(-84-16\right)\)

\(=17.\left(-100\right)\)

\(=-1700\)

4/ \(1975.\left(-115\right)+1975.15\)

\(=1975.\left(-115+15\right)\)

\(=1975.\left(-100\right)\)

\(=-197500\)

5/ \(-145.\left(13-57\right)+57.\left(10-145\right)\)

\(=-145.13-145.\left(-57\right)+57.10+57.\left(-145\right)\)

\(=-145.\left(-57+57\right)-145.13+57.10\)

\(=0-1885+570\)

\(=-1315\)

6/ \(157.17-157.7\)

\(=157.\left(17-7\right)\)

\(=157.10\)

\(=1570\)

7/ \(199.\left(15-17\right)-199.\left(-17+5\right)\)

\(=199.\left(-2\right)-199.\left(-12\right)\)

\(=199.\left(-2\right)+199.12\)

\(=199.\left(-2+12\right)\)

\(=199.10\)

\(=1990\)

8/ \(-39.\left(5-99\right)+99.\left(10-39\right)\)

\(=-39.5-39.\left(-99\right)+99.10+99.\left(-39\right)\)

\(=-39.\left(-99+99\right)-39.5+99.10\)

\(=0-195+990\)

\(=795\)

9/ \(-38.\left(25-4\right)+25.\left(-4+38\right)\)

\(=-38.25-38.\left(-4\right)+25.\left(-4\right)+25.38\)

\(=25.\left(-38+38\right)-4.\left(-38+25\right)\)

\(=0-4.\left(-13\right)\)

\(=52\)

10/ \(\left(-37\right).86+37.76\)

\(=37.\left(-86\right)+37.76\)

\(=37.\left(-86+76\right)\)

\(=37.\left(-10\right)\)

\(=-370\)

\(a,157.17-157.7=157\left(17-7\right)=1570\)

\(b,5.\left(-3+2\right)-7.\left(5-4\right)=-5-7=-12\)

\(c,17.\left(-84\right)+17\left(-16\right)=17\left[\left(-84\right)+\left(-16\right)\right]=-1700\)

\(d,-145.\left(13-57\right)+57.\left(10-145\right)=6380-7695=-1315\)

\(e,199.\left(15-17\right)-199.\left(-17+5\right)=199.10=1990\)

hơi dài quá hỏi từng câu thôi nhé

\(5.\left(-3+2\right)-7.\left(5-4\right)\)

\(=-5-7\)

\(=-12\)

\(2.3.\left(-5+6\right)-4.\left(3-2\right)\)

\(=6-4\)

\(=2\)

1)    5(-3+2)-7.(5-4) = -5 -7 = - 12

2)    3(-5+6)-4.(3-2)= 3 - 4 = - 1

3)    17.(-84) + 17.(-16) = 17. (-100) = - 1700

4)   1975.(-115)+1975.15 = 1975.(-100) = - 197500

5)-145.(13-57)+57(10-145) = 6380 + (-7695) = -1315

6)  157.17-157.7 = 157.10= 1570

7)199.(15-17)-199.(-17+5) = (-398).(-2388) = 950424

8) -39.(5-99)+99.(10-39)= 3666 + (-2871) = 795

9)  -38.(25-4)+25.(-4+38) = -798+850= 52

10)  (-37).86 +37.76 = 37.(-10) = -370

a)= \(2^3\left(17-14\right)\)

\(=8.3\)

\(=24\)

b)\(=17\left(85+15\right)-120\)

\(=17.100-120\)

\(=1700-120\)

\(=1580\)

c)\(=\left(25.4\right).\left(125.8\right).\left(2.5\right)\)

\(=100.1000.10\)

\(=1000000\)

d)\(=24.53+24.87-24.40\)

\(=24\left(53+87-40\right)\)

\(=24.100\)

\(=2400\)

e)\(=5.7.77-7.60-7.7.25-15.6.7\)

\(=7\left(5.77-60-7.25-15.6\right)\)

\(=7\left(385-60-175-90\right)\)

\(=7.60\)

\(=420\)

1, 17.(-84) + 17.(-16)

= - 17.84 - 17.16

= -17.(84 + 16)

= -17.100

= -1700

2; 15.(58) - 15.(48)

= 15.(58 - 48)

= 15. 10

= 150

3, -37.86 + 37.76

= -37.(86 - 76)

= -37.10

= - 370

4, 1975.(-115) + 1975.75

= 1975. (-115  + 75)

= 1975 .(-40)

= - 79000 

5, 79.89 - 79.(-11)

= 79.(89 + 11)

= 79.100

= 7900

1, 17.(-84) + 17.(-16)

= - 17.84 - 17.16

= -17.(84 + 16)

= -17.100

= -1700

2; 15.(58) - 15.(48)

= 15.(58 - 48)

= 15. 10

= 150

3, -37.86 + 37.76

= -37.(86 - 76)

= -37.10

= - 370

4, 1975.(-115) + 1975.75

= 1975. (-115  + 75)

= 1975 .(-40)

= - 79000 

5, 79.89 - 79.(-11)

= 79.(89 + 11)

= 79.100

= 7900

1: =-15+10-35+28=-12

3: =20-12-8+12=12

2) -3(4 - 7) + 5(-3 + 2)

= -3.4 + 3.7 - 5.3 + 5.2

= -12 + 21 -15 + 10

= 31 - 27

= 4

4) -5(2 - 7) + 4(2 - 5)

= -5.2 + 5.7 + 4.2 - 4.5

= -10 + 35 + 8 - 20

= 38 - 30

= 8

5) 6(-3 - 7) - 7(3 + 5)

= -6.3 - 6.7 - 7.3 - 7.5

= -18 - 42 - 21 - 35

= -116

6) 3(-5 + 6) - 4(3 - 2)

= -3.5 + 3.6 - 4.3 + 4.2

= -15 + 18 - 12 + 8

= 26 - 27

= -1

Nhìn nó rối ghê á

1: =-15+10-35+28=-32

rối thật đó