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\(2016\times105-2016\times4-2016\)
\(=2016\times\left(105-4-1\right)\)
\(=2016\times100\)
\(=201600\)
\(x\times24+x\times6=240\)
\(x\times\left(24+6\right)=240\)
\(x\times30=240\)
\(x=240:30\)
\(x=8\)
\(x-167\times15=167\times185\)
\(x-2505=30895\)
\(x=30895+2505\)
\(x=33400\)
\(173\times105+173\times96-173\)
\(=173\times\left(105+96-1\right)\)
\(=173\times200\)
\(=34600\)
1. 2016 x 105 - 2016 x 4 - 2016
= 211680 - 8064 - 2016
= 203616 - 2016
= 201600
2. X x 24 + X x 6 = 240
X x (24 + 6) = 240
X x 30 = 240
X = 240 : 30
X = 8
3. X - 167 x 15 = 167 x 185
X - 2505 = 30895
X = 30895 - 2505
X = 28390
4. 173 x 105 + 173 x 96 - 173
= 18165 + 16608 - 173
= 34773 - 173
= 34600
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\(\dfrac{3}{7}:\dfrac{7}{x}:\dfrac{3}{4}=\dfrac{12}{105}\)
\(\dfrac{3}{7}.\dfrac{x}{7}=\dfrac{3}{35}\)
\(\dfrac{x}{7}=\dfrac{1}{5}\)
\(x=\dfrac{1}{5}.7=\dfrac{7}{5}\)
tìm x biết :
\(\dfrac{3}{7}\) : \(\dfrac{7}{x}\) : \(\dfrac{3}{4}\) = \(\dfrac{12}{105}\)
\(\dfrac{3}{7}\) : \(\dfrac{7}{x}\) = \(\dfrac{12}{105}\)\(\times\) \(\dfrac{3}{4}\)
\(\dfrac{3}{7}\) \(\times\) \(\dfrac{x}{7}\) = \(\dfrac{3}{35}\)
\(\dfrac{x}{7}\) = \(\dfrac{3}{35}\) : \(\dfrac{3}{7}\)
\(\dfrac{x}{7}\) = \(\dfrac{1}{5}\)
\(x\) = \(\dfrac{1}{5}\) \(\times\) 7
\(x\) = \(\dfrac{7}{5}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(1.\)
\(x\div\frac{4}{3}=\frac{3}{7}+\frac{2}{5}\)
\(x\div\frac{4}{3}=\frac{29}{35}\)
\(x=\frac{29}{35}\times\frac{4}{3}\)
\(x=\frac{116}{105}\)
\(2.\)
\(\frac{2}{5}\times\frac{3}{6}+\frac{7}{5}\div\frac{3}{5}\)
\(=\frac{1}{5}+\frac{7}{5}\times\frac{5}{3}\)
\(=\frac{1}{5}+\frac{7}{3}\)
\(=\frac{3}{15}+\frac{35}{15}\)
\(=\frac{38}{15}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(y-\dfrac{2}{3}=\dfrac{4}{5}\times\dfrac{3}{4}\\ y-\dfrac{2}{3}=\dfrac{3}{5}\\ y=\dfrac{3}{5}+\dfrac{2}{3}\\ y=\dfrac{9}{15}+\dfrac{10}{15}\\ y=\dfrac{19}{15}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a,Ta có:\(\frac{12}{7}.x=\frac{15}{6}\)
\(x=\frac{15}{6}:\frac{12}{7}\)
\(x=\frac{15}{6}.\frac{7}{12}=\frac{35}{24}\)
b,\(x=\frac{29}{7}-\frac{3}{2}=\frac{58-21}{14}=\frac{37}{14}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, \(\frac{2}{3}:\frac{5}{7}:\frac{x}{9}=\frac{2}{7}:\frac{3}{5}:\frac{10}{9}\Leftrightarrow\frac{2\times7\times9}{3\times5\times x}=\frac{2\times5\times9}{7\times3\times10}\Leftrightarrow\frac{42}{5\times x}=\frac{3}{7}\Leftrightarrow294=15\times x\Leftrightarrow x=19,6\)
Các phần sau tương tự.
Dùng phương pháp nhân chéo và kiểm tra trình độ tính toán, khả năng rút gọn.
Thay kết quả vào x để kiểm tra lại bài.
![](https://rs.olm.vn/images/avt/0.png?1311)
Giá trị của \(x\)trong biểu thức : \(\frac{4}{7}\times x=\frac{1}{3}\)
\(x=\frac{1}{3}\div\frac{4}{7}\)
\(x=\frac{1}{3}\times\frac{7}{4}\)
\(x=\frac{7}{12}\)
Vì \(x=\frac{7}{12}\)ta chọn ý \(D.\frac{7}{12}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{4}{5}\)\(\times\)\(\frac{3}{7}\)\(\times\)\(\frac{x}{3}\)=\(\frac{24}{105}\)
= \(\frac{4\times3}{5\times7}\)\(\times\)\(\frac{x}{3}=\frac{24}{105}\)
=\(\frac{12}{35}\times\frac{x}{3}=\frac{24}{105}\)
\(\Rightarrow\frac{x}{3}=\frac{24}{105}:\frac{12}{35}\)
=\(\frac{x}{3}=\frac{2}{3}\)
Vậy X = 2
4/5 x 3/7 x X/3 = 24/105
12/35 x X/3 = 24/105
X/3 = 24/105 : 12/35
X/3 = 2/3
X = 2/3 x 3
X = 2