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a) (9458-x)x5=41195 b) (9x x)x6=23490
9458-x =41195:5 9 x x =23490:6
9458-x =8239 9 x x =3916
x=9458-8239 x = 3915:9
x=1219 x=435
c)9x(x+5)=729
x+5=729:9
x+5=81
x=81-5
x=76 k mk nha
a) (9458 - X) x 5 = 41195
9458 - X = 41195 : 5
9458 - X = 8239
X = 9458 - 8239
X = 1219
b) (9 x X) x 6 = 23490
9 x X = 23490 : 6
9 x X = 3915
X = 3915 : 9
X = 435
c) 9 x (X + 5) = 729
X + 5 = 729 : 9
X + 5 = 81
X = 81 - 5
X = 76
a)3x(x+726)=2745.
= x+726 =2745:3.
= x+726 =915.
= x =915-726
= x =189.
b)(x+426):3=2625.
= x+426 =2625x3
= x+426 =7875
= x =7875-426
= x =7449.
c)(9458-x)x5=41195.
= 9458-x =41195:5
= 9458-x =8239.
= x =9458-8239.
= x =1219.
d)Sai đề rồi bạn nhé.
\(1-\)\(a,\frac{7}{8}-\frac{2}{3}=\frac{21}{24}-\frac{16}{24}=\frac{5}{24}\)
\(b,\frac{7}{8}-\frac{2}{3}\times\frac{3}{4}=\frac{7}{8}-\frac{1}{2}=\frac{7}{8}-\frac{4}{8}=\frac{3}{8}\)
\(2-\)\(a,\frac{5}{8}-x=\frac{5}{9}\)
\(x=\frac{5}{8}-\frac{5}{9}\)
\(x=\frac{5}{72}\)
\(b,\frac{3}{4}:x=\frac{2}{5}\)
\(x=\frac{3}{4}:\frac{2}{5}\)
\(x=\frac{15}{8}\)
Tính hợp lý:
2 x 144 x 18 + 4 x 41 x 9 + 3 x 15 x 12=?
Help me! Mình đang cần ngay trong ngày hôm nay!
2 x 144 x 18 + 4 x 41 x 9 + 3 x 15 x 12
=36x144+36x41+36x15
=36x(144+41+15)
=36x200
=7200
HT
\(\left(\frac{1}{3.5}+\frac{1}{5.7}+\frac{1}{7.9}+....+\frac{1}{19.21}\right).x=\frac{9}{7}\)
\(\left(\frac{5-3}{3.5}+\frac{7-5}{5.7}+\frac{9-7}{7.9}+...+\frac{21-19}{19.21}\right).x=\frac{9}{7}\)
\(\left[\frac{1}{2}.\left(\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+\frac{1}{7}-\frac{1}{9}+...+\frac{1}{19}-\frac{1}{21}\right)\right].x=\frac{9}{7}\)
\(\left[\frac{1}{2}.\left(\frac{1}{3}-\frac{1}{21}\right)\right].x=\frac{9}{7}\)
\(\left[\frac{1}{2}.\frac{2}{7}\right].x=\frac{9}{7}\)
\(\frac{1}{7}.x=\frac{9}{7}\)
\(\Rightarrow x=\frac{9}{7}\div\frac{1}{7}=9\)
\(\left(\frac{1}{3.5}+\frac{1}{5.7}+\frac{1}{7.9}+...+\frac{1}{19.21}\right)x=\frac{9}{7}\)
\(\Leftrightarrow\left(\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+...+\frac{1}{19}-\frac{1}{21}\right)x=\frac{9}{7}\)
\(\Leftrightarrow\left(\frac{1}{3}-\frac{1}{21}\right)x=\frac{9}{7}\)
\(\Leftrightarrow\frac{2}{7}x=\frac{9}{7}\)
\(\Leftrightarrow x=\frac{9}{2}\)
9485 - x =41195:5 roi tim x lay 9485 : cho ket qua tim dc
(9485 - x) x 5 =41195
9485 - x =41195:5
9485 - x =8239
x =9485-8239
x =1246
Con (9 x y) x 6 + 8239
Hình như sai đề!!!