X x 20-11 x X =972
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\(y.\left(20+16\right)=972\Leftrightarrow36y=972\Leftrightarrow y=27\)
X x 20 + 16 x X = 972
X x (20+16) = 972
X x 36 = 972
X= 972 :36
X= 27
Vậy X = 27
X x 20 +16 x X =972
X x (20+16)=972
X x 36 = 972
X = 27
VẬY X=27
\(\frac{x-971}{972}+\frac{x-973}{970}+\frac{x-975}{968}+\frac{x-977}{966}=\frac{x-972}{971}+\frac{x-970}{973}+\frac{x-968}{975}+\frac{x-966}{977}\)
\(\Rightarrow\frac{x-971}{972}-1+\frac{x-973}{970}-1+\frac{x-975}{968}-1+\frac{x-977}{966}-1=\frac{x-972}{971}-1+\frac{x-970}{973}-1+\frac{x-968}{975}-1+\frac{x-966}{977}-1\)\(\Rightarrow\frac{x-1943}{972}+\frac{x-1943}{970}+\frac{x-1943}{968}+\frac{x-1943}{966}=\frac{x-1943}{971}+\frac{x-1943}{973}+\frac{x-1943}{975}+\frac{x-966}{977}\)
\(\Leftrightarrow\frac{x-1943}{972}+\frac{x-1943}{970}+\frac{x-1943}{968}+\frac{x-1943}{966}-\frac{x-1943}{971}-\frac{x-1943}{973}-\frac{x-1943}{975}-\frac{x-966}{977}=0\)
\(\Leftrightarrow\left(x-1943\right).\left(\frac{1}{972}+\frac{1}{970}+\frac{1}{968}+\frac{1}{966}-\frac{1}{971}-\frac{1}{973}+\frac{1}{975}+\frac{1}{977}\right)=0\)
\(\Leftrightarrow\left(x-1943\right)=0\Leftrightarrow x=1943\)
Vậy...
Hướng dẫn giải:
a.
x x 6 = 972
x = 972 : 6
x = 162
b.
7332 : x = 12
x = 7332 : 12
x = 611
`95,13 xx a + 2,07 xx a = 972`
`=>(95,13 + 2,07)xx a = 972`
`=>97,2xx a = 972`
`=>x=972 : 97,2`
`=>x=10`
\(95,13a+2,07a=972\)
\(\Rightarrow\left(95,13+2,07\right)a=972\)
\(\Rightarrow97,2a=972\)
\(\Rightarrow a=972:97,2=10\)
Vậy \(a=10\)
X x 20 - 11 x X = 972
X x ( 20 - 11 ) = 972
X x 9 = 972
X = 972 : 9
X = 108
x.20-11.x=972
=x.(20-11)=972
=x.9=972
=x=972:9
=x=108
Vậy x=108