x * 0,75 + 3/4 * 5 + 2 : 4/3 = 10,5
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![](https://rs.olm.vn/images/avt/0.png?1311)
27*18*15=7290
3.8*2.5*4=38
1.9*1.4*1.5=3.99
\(\frac{4}{3}x\frac{5}{4}x\frac{2}{3}=\frac{10}{9}\)
15.5*6.4*10=992
1.75*0.4*0.8=0.56
8*5*4.5=180
2*0.5*0.75=0.75
(15-12)*10.5*8=252
10*4.5*12=540
= 7290
= 38
= 3,99
= 10 / 9
= 992
= 0,56
= 180
= 0,75
= 252
= 540
![](https://rs.olm.vn/images/avt/0.png?1311)
1) 2,75 - 5/6 × 2/5 = 2,75 - (5/6) × (2/5) = 2,75 - 1/3 = 2,75 - 0,33 = 2,42
2) 1,25 - (5/6 - 0,75) - 3/5 = 1,25 - (5/6 - 0,75) - 3/5 = 1,25 - (5/6 - 3/4) - 3/5 = 1,25 - (5/6 - 9/12) - 3/5 = 1,25 - (10/12 - 9/12) - 3/5 = 1,25 - 1/12 - 3/5 = 1,25 - 0,08 - 0,6 = 1,25 - 0,68 = 0,57
3) 4/9 × 0,75 + 8/5 + 3,125 = (4/9) × 0,75 + 8/5 + 3,125 = 0,44 + 8/5 + 3,125 = 0,44 + 1,6 + 3,125 = 0,44 + 4,725 = 5,165
4) 1,125 - 4/7 - 0,12 = 1,125 - (4/7) - 0,12 = 1,125 - 0,57 - 0,12 = 0,435 - 0,12 = 0,315
5) (1/3 + 0,4) × 3,5 + (1/6 + 0,75) × 6/5
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(0,75\times26+49\times\frac{3}{4}+\frac{3}{4}\times24+\) \(0,75\)
\(=\) \(0,75\times\left(26+1\right)+\frac{3}{4}\times\left(49+24\right)\)
\(=\) \(\frac{3}{4}\times27+\frac{3}{4}\times73\)
\(=\) \(\frac{3}{4}\times\left(27+73\right)\)
\(=\)\(\frac{3}{4}\times100=75\)
b) câu b,c làm tương tự
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\frac{x-3}{5}=6-\frac{1-2x}{3}\)
\(\Leftrightarrow\frac{3\left(x-3\right)}{15}=\frac{90-5\left(1-2x\right)}{15}\)
\(\Leftrightarrow3x-9=90-5+10x\)
\(\Leftrightarrow-7x=94\)
\(\Leftrightarrow x=-\frac{94}{7}\)
b) \(\frac{3x-2}{6}-5=3-\frac{2\left(x+7\right)}{4}\)
\(\Leftrightarrow\frac{2\left(3x-2\right)-60}{12}=\frac{36-6\left(x+7\right)}{12}\)
\(\Leftrightarrow6x-4-60=36-6x-42\)
\(\Leftrightarrow12x=52\)
\(\Leftrightarrow x=\frac{29}{6}\)
c) \(\frac{3x-9}{4}+\frac{4x-10,5}{10}=\frac{3\left(x+1\right)}{5}+6\)
\(\Leftrightarrow\frac{5\left(3x-9\right)}{20}+\frac{2\left(4x-10,5\right)}{20}=\frac{12\left(x+1\right)+120}{20}\)
\(\Leftrightarrow15x-45+8x-21=12x+12+120\)
\(\Leftrightarrow23x-66=12x+132\)
\(\Leftrightarrow11x=198\)
\(\Leftrightarrow x=18\)
Chúc cậu học tốt !
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,-\dfrac{3}{5}-x=-0,75\\ -\dfrac{3}{5}-x=-\dfrac{3}{4}\\ x=-\dfrac{3}{5}-\left(-\dfrac{3}{4}\right)\\ x=-\dfrac{3}{5}+\dfrac{3}{4}=\dfrac{3}{20}\\ ---\\ b,1\dfrac{4}{5}=-0,15-x\\ \dfrac{9}{5}=-\dfrac{3}{20}-x\\ x=-\dfrac{3}{20}-\dfrac{9}{5}\\ x=-\dfrac{3}{20}-\dfrac{36}{20}\\ x=-\dfrac{39}{20}\\ ----\\ c,2\dfrac{1}{2}-x+\dfrac{4}{5}=\dfrac{2}{3}-\left(-\dfrac{4}{7}\right)\\ \dfrac{5}{2}-x+\dfrac{4}{5}=\dfrac{2}{3}+\dfrac{4}{7}\\ \dfrac{33}{10}-x=\dfrac{26}{21}\\ x=\dfrac{33}{10}-\dfrac{26}{21}\\ x=\dfrac{433}{210}\)
`x . 0,75 + 3/4 . 5 + 2 : 4/3 = 10,5`
`x . 0,75 + 3/4 . 5 + 2 : 4/3 =21/2`
`x. 3/4 + 3/4 . 5 + 2 : 4/3 = 21/2`
`x . 3/4 + 15/4 + 2 xx 3/4 = 21/2`
`x. 3/4 + 21/4=21/2`
`x.3/4 = 21/2 - 21/4`
`x.3/4 = 21/4`
`x=21/4 : 3/4`
`x=21/4 xx 4/3`
`x=21/3`
`x=7`
Vậy `x=7`
\(x\times0,75+\dfrac{3}{4}\times5+2\div\dfrac{4}{3}=10,5\)
\(x\times0,75+\dfrac{15}{4}+2\times\dfrac{3}{4}=10,5\)
\(x\times0,75+\dfrac{15}{4}+\dfrac{6}{4}=10,5\)
\(x\times0,75+\dfrac{21}{4}=10,5\)
\(x\times0,75=\dfrac{21}{4}\)
\(x=7\)