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`@` `\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`
![](https://rs.olm.vn/images/avt/0.png?1311)
\(18.15+35+15.32+35.4+9\)
\(=\left(18.15+15.32\right)+\left(35+35.4\right)+9\)
\(=\left[15.\left(18+32\right)\right]+\left[35.\left(1+4\right)\right]+9\)
\(=\left[15.50\right]+\left[35.5\right]+9\)
\(=750+175+9\)
\(=934\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bai nay la Phan so hay 2 bai riêng chu ban ghi vay ai ma biết lam the nao
\(a,\frac{-15}{32}.\left(\frac{-18}{25}\right).\left(\frac{-1}{2}\right)^2\)
\(=\frac{-15}{32}.\left(\frac{-18}{25}\right).\frac{1}{4}\)
\(=\frac{-15.\left(-18\right).1}{32.25.4}\)
\(=\frac{27}{320}\)
\(b,\frac{35}{34}.\left(\frac{-17}{39}\right).\frac{26}{45}\)
\(=\frac{35.\left(-17\right).26}{34.39.45}\)
\(=\frac{-7}{27}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
1: Ta có: \(2155-\left(174+2155\right)+\left(-68+174\right)\)
\(=2155-174-2155-68+174\)
=-68
2) Ta có: \(-25\cdot72+25\cdot21-49\cdot25\)
\(=-25\cdot\left(72-21+49\right)\)
\(=-25\cdot100=-2500\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(32\left(10-25\right)-35\left(18-32\right)\)
\(=32\left(10-25\right)-35\times18+35\times32\)
\(=32\left(10-25+35\right)-35\times18\)
\(=32\times20-35\times18\)
\(=640-630\)
\(=10\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\dfrac{4}{5}\); \(\dfrac{3}{4}\); \(\dfrac{11}{13}\)
b) \(\dfrac{25}{35}\); \(\dfrac{100}{140}\); \(\dfrac{85}{119}\)
a) Những phân số tối giản là: \(\dfrac{4}{5};\dfrac{3}{4};\dfrac{11}{13}\)
b) Những phân số bằng \(\dfrac{5}{7}\) là: \(\dfrac{25}{35};\dfrac{100}{140};\dfrac{16}{28};\dfrac{85}{119}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
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!!!
18. 25 + 35 + 15. 32 + 35. 49
=450+35+480+1715
=485+480+1715
=965+1715
=2680
Ta có:
18.25 + 35 + 15.32 + 35.49
= 450 + 35 + 480 + 1715
= 2680