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a) x = 9867655 - 456788
x = 9410867
b) x = 9886 + 23345
x = 33231
c) x = 986352 - 283476
x = 702876
d) y =44772 : 123
y = 364
e) a = 2345 x 637
a = 1493765
g) x = 212552 : 326
x = 652
Bài 2. Tìm x:
a/ x + 456788 = 9867655
x = 9867655 -456788
x = 9410867
b/ x – 23345 = 9886
x = 9886 + 23345
x =33231
c/ 283476 + x = 986352
x = 986352 - 283476
x= 702876
d/ y × 123 = 44772
y = 44772 : 123
y = 364
e/ a : 637 = 2345
a = 2345 x 637
a = 1493765
g/ 212 552 : x = 326
x = 212 552 : 326
x = 652
h/ 40000 – x =3876
x = 40000 – 3876
x = 36124
i/ (x + 1233) – 1978 = 9876
x + 1233 = 9876 + 1978
x + 1233 = 11854
k/ x : 2 : 3 = 138
x : 2 = 138 x 3
x : 2 =414
x = 414 x 2
x = 828
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\(a,\Leftrightarrow x\left(12+7+1\right)=100\)
\(\Leftrightarrow x.20=100\)
\(\Leftrightarrow x=50\)
\(b,\Leftrightarrow x\left(4+3\right)=1071\)
\(\Leftrightarrow7x=1071\)
\(\Leftrightarrow x=153\)
\(c,\Leftrightarrow x-60720=960\times5\)
\(\Leftrightarrow x-60720=4800\)
\(\Leftrightarrow x=4800+60720\)
\(\Leftrightarrow x=65520\)
\(d,\Leftrightarrow x:4=22850-11250\)
\(\Leftrightarrow x:4=11600\)
\(\Leftrightarrow x=46400\)
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\(a,x-\dfrac{5}{7}=\dfrac{3}{5}\times\dfrac{1}{2}\)
\(x-\dfrac{5}{7}=\dfrac{3}{10}\)
\(x=\dfrac{3}{10}+\dfrac{5}{7}\)
\(x=\dfrac{21}{70}+\dfrac{50}{70}\)
\(x=\dfrac{71}{70}\)
\(Vayx=\dfrac{71}{70}\)
\(b,x\times\dfrac{2}{3}=\dfrac{5}{8}+\dfrac{3}{4}\)
\(x\times\dfrac{2}{3}=\dfrac{5}{8}+\dfrac{6}{8}\)
\(x\times\dfrac{2}{3}=\dfrac{11}{8}\)
\(x=\dfrac{11}{8}:\dfrac{2}{3}\)
\(x=\dfrac{11}{8}\times\dfrac{3}{2}\)
\(x=\dfrac{33}{16}\)
\(Vayx=\dfrac{33}{16}\)
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a) x + \(\dfrac{3}{4}\) = \(\dfrac{5}{3}\)
x = \(\dfrac{5}{3}\) - \(\dfrac{3}{4}\)
x = \(\dfrac{20}{12}\) - \(\dfrac{9}{12}\)
x = \(\dfrac{11}{12}\)
b) x - \(\dfrac{2}{3}\) = \(\dfrac{7}{2}\)
x = \(\dfrac{7}{2}\) + \(\dfrac{2}{3}\)
x = \(\dfrac{21}{6}\) + \(\dfrac{4}{6}\)
x = \(\dfrac{25}{6}\)
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\(a,246:x+34:x=5\\ \Rightarrow\left(246+34\right):x=5\\ \Rightarrow280:x=5\\ \Rightarrow x=56\\ b,360:x-126:x=6\\ \Rightarrow\left(360-126\right):x=6\\ \Rightarrow234:x=6\\ \Rightarrow x=39\)
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\(a,1337+13\times x=6745\\ \Rightarrow13\times x=6745-1337\\ \Rightarrow x=5408:13\\ \Rightarrow x=416\\ b,142\times x-41\times x-x=408000\\ \Rightarrow x\times\left(142-41-1\right)=408000\\ \Rightarrow x\times100=408000\\ \Rightarrow x=408000:100\\ \Rightarrow x=4080\)
a. 1337 + 13 x x = 6745
13 x x = 6745-1337
13 x x = 5408
x = 5408 : 13
x = 416
b. 142 x x – 41 x x – x = 408000
142 x x – 41 x x – x x 1 = 408000
(142-41-1) x x = 408 000
100 x x = 408000
x = 408 000:100
x = 4080
\(a,243\times x=76545\\ \Rightarrow x=76545:243\\ \Rightarrow x=315\\ b,97328:x=316\\ \Rightarrow x=97328:316\\ \Rightarrow x=308\)
Cảm ơn bạn nhiều nhé !