`@` `\text {Ans}`

`\downarrow`

`18*15 + 35 + 15*32 + 35*49`

`= 15 (18+32) + 35(1+49)`

`= 15*50 + 35*50`

`= 50*(15+35)`

`= 50*50`

`= 2500`

=15*50+35*50

=50*50

=2500

\(18.15+35+15.32+35.4+9\)

\(=\left(18.15+15.32\right)+\left(35+35.4\right)+9\)

\(=\left[15.\left(18+32\right)\right]+\left[35.\left(1+4\right)\right]+9\)

\(=\left[15.50\right]+\left[35.5\right]+9\)

\(=750+175+9\)

\(=934\)

= 454.46875

Bai nay la Phan so hay 2 bai riêng chu ban ghi vay ai ma biết lam the nao

\(a,\frac{-15}{32}.\left(\frac{-18}{25}\right).\left(\frac{-1}{2}\right)^2\)

\(=\frac{-15}{32}.\left(\frac{-18}{25}\right).\frac{1}{4}\)

\(=\frac{-15.\left(-18\right).1}{32.25.4}\)

\(=\frac{27}{320}\)

\(b,\frac{35}{34}.\left(\frac{-17}{39}\right).\frac{26}{45}\)

\(=\frac{35.\left(-17\right).26}{34.39.45}\)

\(=\frac{-7}{27}\)

a: 29+131+237+763

=160+1000

=1160

b: 65+327+15+73

=65+15+327+73

=80+400

=480

c: \(12+54:8-8\)

=12+3-8

=15-8

=7

d: \(45\cdot58+45\cdot42\)

\(=45\cdot\left(58+42\right)\)

\(=45\cdot100=4500\)

e: \(35\cdot34+35\cdot26+40\cdot35\)

\(=35\cdot\left(34+26+40\right)\)

\(=35\cdot100=3500\)

f: \(65\cdot25+65\cdot45+30\cdot65\)

\(=65\cdot\left(25+45+30\right)\)

\(=65\cdot100=6500\)

g: \(750:\left\lbrace32-\left\lbrack2^2+\left(5\cdot3^2-42\right)\right\rbrack\right\rbrace+100\)

\(=\frac{750}{32-\left\lbrack4+5\cdot9-42\right\rbrack}+100=\frac{750}{32-4-45+42}+100\)

\(=\frac{750}{28-3}+100\)

=750:25+100

=30+100

=130

h: \(\left\lbrace630:\left\lbrack16+3\cdot\left(6+3\cdot4\right)\right\rbrack\right\rbrace-1\)

\(=\frac{630}{16+3\cdot\left(6+12\right)}-1=\frac{630}{16+3\cdot18}-1\)

\(=\frac{630}{70}-1\)

=9-1=8

i: \(5871:\left\lbrack928-\left(247-82\right)\cdot5\right\rbrack+2175^0\)

\(=\frac{5871}{928-165\cdot5}+1\)

\(=\frac{5871}{928-825}+1=\frac{5871}{103}+1=57+1=58\)

k: \(375:\left\lbrace32-\left\lbrack4+\left(5\cdot3^2-42\right)\right\rbrack\right\rbrace-14\)

\(=\frac{375}{32-\left\lbrack4+5\cdot9-42\right\rbrack}-14\)

\(=\frac{375}{32-\left\lbrack4+45-42\right\rbrack}-14=\frac{375}{32-\left(4+3\right)}-14=\frac{375}{32-7}-14\)

\(=\frac{375}{25}-14\)

=15-14

=1

=32.(10-25)-35.18+32.35

=32.(10-25+35)-35.18

=32.20-630

=640-630

=10

\(32\left(10-25\right)-35\left(18-32\right)\)

\(=32\left(10-25\right)-35\times18+35\times32\)

\(=32\left(10-25+35\right)-35\times18\)

\(=32\times20-35\times18\)

\(=640-630\)

\(=10\)

a. 32 + (–49) – |–15|

= 32 - 49 - 15 

= -32

b. (–12) – 80 : (–16) + (–25) . (–3) 

= - 12 + 5 + 75

= 68

c. 17 – 15 . (–2)² – 144 : |–16|

= 17 - 15.4 - 144 : 16

= 17 - 60 - 9

= -52

a, 32 + (-49) -|-15|

= -17 - 15

= -32

b, (-12) - 80 : (-16) + (-25) . (-3)

= (-12) - (-5) + 75

= -7 + 75

= 68

c, 17 - 15 . (-2)2 - 144 :|-16|

= 17 - 15. 4 - 144 : 16

= 17 - 60 - 9

= -43 - 9

= -52

d, -35 . 54 + 32.(-63) - 32(-17)

= -1890 + 32. [-63 - (-17)]

= -1890 + 32. (-46)

= -1890 + (-1472)

= -3362.

Tham khảo nha!!!

a) 15 . (27 + 18 + 6 ) + 15 . ( 23 +12 ) =  15. 51 + 15 . 35 = 765 + 525 = 1290

b) 14 . 35 . 5 + 10 . 25 . 7 + 20 . 70 = 2450 + 1750 + 1400 = 2452450

c) 53 . ( 51 + 4 ) + 53 . ( 49  + 96 ) + 53 = 53 . 55 + 53 . 145 + 53 = 2915 . 7685 = 22401775

d) 46 . ( 27 +75 ) +8 . ( 58 + 25 ) + 8 . ( 58 + 25 ) . 2 = 46 . 102 + 8 . 83 + 8 . 83 =  4692 + 664 + 664 = 6020

1: Ta có: \(2155-\left(174+2155\right)+\left(-68+174\right)\)

\(=2155-174-2155-68+174\)

=-68

2) Ta có: \(-25\cdot72+25\cdot21-49\cdot25\)

\(=-25\cdot\left(72-21+49\right)\)

\(=-25\cdot100=-2500\)