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a) \(5\times\left(3+7\times x\right)=400\)
\(3+7\times x=80\)
\(7\times x=77\)
\(x=11\)
b) \(x\times37+x\times63=1200\)
\(x\times\left(37+63\right)=1200\)
\(x\times100=1200\)
\(x=12\)
c) \(x\times6+12:3=40\)
\(x\times6+4=40\)
\(x\times6=36\)
\(x=6\)
d) \(4+6\times\left(x+1\right)=70\)
\(6\times\left(x+1\right)=66\)
\(x+1=11\)
\(x=10\)
e) \(163:x+34:x=10\)
\(\left(163+34\right):x=10\)
\(197:x=10\)
\(x=19,7\)
`(3xx4xx7)/(5xx3xx4)=7/5`
`(2xx5xx6xx8)/(6xx2xx8xx9)=5/9`
`(4xx5xx6)/(3xx10xx8)= (4xx5xx6)/(3xx5xx2xx4xx2)= 6/(3xx2xx2)= 6/(6xx2)=1/2`
\(a,\dfrac{3\times4\times7}{5\times3\times4}=\dfrac{7}{5}\)
\(b,\dfrac{2\times5\times6\times8}{6\times2\times8\times9}=\dfrac{5}{9}\)
\(c,\dfrac{4\times5\times6}{3\times10\times8}=\dfrac{2}{4}=\dfrac{1}{2}\)
x nhan 109 - x nhan 8 - x = 1200
x nhan 109 - x nhan 8 - x nhan 1 = 1200
x nhan (109 - 8 - 1) = 1200
x nhan 100 = 1200
x = 1200 : 100
x = 12
Vay x = 12
1) 1/3 x 1/2 x 3/7 = 1/6 x 3/7 = 1/14
2) 5/4 x 1/3 + 1/7 = 5/12 + 1/7 = 47/84
3) 8 x (8/9 - 2/3) = 8 x 2/9 = 16/9
4) 5/6 x 48/20 x 1/2 = 2 x 1/2 = 1
5) (2/5 + 3/4) x 8 = 23/20 x 8 = 46/5
6) 10 x (1/2 - 1/5) = 10 x 3/10 = 3
x * 109 - x * 8 - x = 1200
x * 109 - x * 8 - x * 1 = 1200
x * ( 109 - 8 - 1 ) = 1200
x * 100 = 1200
x = 1200 : 100
x = 12
tk mình nhé
bài này đúng 100% luôn
x+2+x+4+x+6+x+8=1200
x+(2+4+6+8)=1200
x+20=1200
x=1200-20
x=1180
cho minh nhe!
\(x+2+x+4+x+6+x+8=1200\)
\(4x+20=1200\)
\(4x=1200-20\)
\(4x=1180\)
\(x=1180:4\)
\(x=295\)