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Sửa lại : \(\frac{5,22\cdot3134+10,44\cdot275+20,88\cdot1,079}{9,4+19,4+29,4+...+179,4+189,4+199,4}\)
\(TS=5,22\cdot3134+10,44\cdot2,75+20,88\cdot1,079\)
\(TS=5,22\cdot4\cdot783,5+10,44\cdot2\cdot1,375+20,88\cdot1,079\)
\(TS=20,88\cdot783,5+20,88\cdot1,375+20,88\cdot1,079\)
\(TS=20,88\cdot\left(783,5+1,375+1,079\right)\)
\(TS=20,88\cdot785,954\)
KC 2 số liên tiếp ở MS là : 19,4 - 9,4 = 10
SSH ở MS là : \(\frac{199,4-9,4}{10}+1=20\) ( SH )
\(\Rightarrow MS=\frac{\left(199,4+9,4\right)\cdot20}{2}=2088=20,88\cdot100\)
\(\Rightarrow\frac{5,22\cdot3134+10,44\cdot275+20,88\cdot1,079}{9,4+19,4+29,4+...+179,4+189,4+199,4}=\frac{20,88\cdot785,954}{20,88\cdot100}=78595,4\)
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a) \(136-x:48-27,8-2,2=92\)
\(136-x:48-30=92\)
\(106-x:48=92\)
\(x:48=106-92\)
\(x:48=14\)
\(x=14\times48\)
\(x=672\)
b) \(43,7-x-8,92+5,22=0,348\times19\)
\(40-x=6,612\)
\(x=40-6,612\)
\(x=33,388\)
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Câu 1 = 5,22 x 3134 + 10,44 x 275 + 20,88 + 1,079 = 16359,48 + 2871 + 20,88 +1,079
= 19252,439
Câu 2 = 9,4 + 19,4 + 29,4 + 39,4 + ................... + 199,4 = ( 199,4 - 9,4 ) : ( 19.4 - 9.4 ) + 1 = 20
= ( 199,4 + 9,4 ) x 20 : 2
= 2088
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5,21 < x < 5,22
x = 5,211 ; 5,212 ; 5,213 ; 5,214 ; 5,215 ; 5,216 ; 5,217
= 5,218 ; 5,219 ; 5,220 ; 5,221
Chúc bạn học tốt!
5,21 < 5,211 ; 5,212 ; 5,213 ; 5,214 ; 5,215 < 5,22
Vậy x có thể bằng : 5,211 ; 5,212 ; 5,213 ; 5,214 ; 5,215
x + 5,22 = 9,08
x = 9,08 - 5,22
x = 3,86
x + 5,22 = 9,08
x = 9, 08 - 5,22
x = 3,86
~ HT~