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X=2/5x4
X=8/5
X+8/5=4/9+3/5
X+8/5=47/45
X=47/45-8/5
X=7/45
vậy X là 7/45
1,
a, \(x\)x 124= 4829-365
\(x\)x 124 = 4464
\(x\)= 4464 :124
\(x\)= 36.
b,\(x\)x 137 = 25 x 3
\(x\)x 137 = 75
\(x\)= \(\frac{75}{137}\)
2,
\(\frac{4}{5}\)x\(\frac{3}{7}+\frac{4}{5}\)x\(\frac{6}{7}-\frac{4}{5}\)x\(\frac{4}{10}\)
=\(\frac{4}{5}\)x\(\left(\frac{3}{7}+\frac{6}{7}-\frac{4}{10}\right)\)=\(\frac{4}{5}\)x\(\frac{31}{35}\)\(\frac{124}{175}\)
\(\text{Bài }1\text{ : Tìm }x\text{ : }\)
\(a,\text{ }x\text{ x }124=4829-365\)
\(x\text{ x }124=4464\)
\(x=4464\text{ : }124\)
\(x=36\)
\(b,\text{ }x\text{ x }137=25\text{ x }3\)
\(x\text{ x }137=75\)
\(x=75\text{ : }137\)
\(x=\frac{75}{137}\)
\(\text{Bài }2\text{ : Tính bằng cách thuận tiện nhất : }\)
\(\frac{4}{5}\text{ x }\frac{3}{7}+\frac{4}{5}\text{ x }\frac{6}{7}-\frac{4}{5}\text{ x }\frac{4}{10}\)
\(=\frac{4}{5}\text{ x }\left(\frac{3}{7}+\frac{6}{7}-\frac{4}{10}\right)\)
\(=\frac{4}{5}\text{ x }\left(\frac{9}{7}-\frac{4}{10}\right)\)
\(=\frac{4}{5}\text{ x }\frac{31}{35}\)
\(=\frac{124}{175}\)
(2+4+...+16+18) x (45 x 3+ 5 x 45 - 90 x 4)
= A x (135 + 225 - 360)
= A x 0
= 0
a) \(\frac{2}{3}\cdot\frac{1}{5}\cdot x=\frac{1}{3}\)
\(\frac{2}{15}\cdot x=\frac{1}{3}\)
\(x=\frac{1}{3}:\frac{2}{15}\)
\(x=\frac{5}{2}\)
b) \(\frac{3}{4}:3+\frac{1}{4}:3-\frac{1}{5}\)
=\(\left(\frac{3}{4}+\frac{1}{4}\right):3-\frac{1}{5}\)
=\(\frac{1}{3}-\frac{1}{5}\)
=\(\frac{2}{15}\)
Tk mk nha!!!
1)
187 + x = 562
x = 562 - 187
x = 375
2)
365 - x = 79
x = 365 - 79
x = 286
3)
1170 : x = 78
x = 1170 : 78
x = 15
4)
x : 852 = 43
x = 43 x 852
x = 36 636
1. x = 375
2. x = 286
3. x = 15
4. x = 36636
Ai k mình mình k lại!