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14,66 - 1,26 - 2,66 - 5,74 = 14,66 - 2,66 - ( 1,26 + 5,74 )
= 12 - 7 = 5
174,56 - 45,25 - 44,56 - 15,75 = ( 174,56 - 44,56 ) - ( 45,25 + 15,75 )
= 130 - 61 = 69
13,28 x 9,9 + 1,328 = ( 13,28 - 1,328 ) x 9,9
= 11,952 x 9,9 = 118,3248
24,65 x 9,99 + 0,2465 = ( 24,65 - 0,2465 ) x 9,99
= 243,790965
![](https://rs.olm.vn/images/avt/0.png?1311)
\(32,4\times6,34+2,66\times32,4+32,4\)
\(=32,4\times\left(6,34+2,66+1\right)\)
\(=32,4\times10=324\)
\(7,5\times4+15\times3\)
\(=30+45=75\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a,\(10:x+7,19:x=3\)
\(\left(10+7,19\right):x=3\)
\(17,19:x=3\)
\(\Rightarrow x=17,19:3\)
\(\Rightarrow x=5,73\)
Vậy x=5,73
b,\(6,24:x+1,26;x=10\)
\(\left(6,24+1,26\right):x=10\)
\(7,5:x=10\)
\(\Rightarrow x=7,5:10\)
Vậy x= 0,75
a) 10:x+7,19:x=3
\(\Rightarrow\)(10+7,19):x=3
\(\Rightarrow\)17,19:x=3
\(\Rightarrow\)x=17,19:3=5,73
b) 6,24:x+1,26:x=10
\(\Rightarrow\)(6,24+1,26):x=10
\(\Rightarrow\)7,5:x=10
\(\Rightarrow\)x=7,5:10=0,75
![](https://rs.olm.vn/images/avt/0.png?1311)
Cách 1:
(6,24 + 1,26) : 0,75 = 7,5 : 0,75 = 10
Cách 2:
(6,24 + 1,26) : 0,75 = 6,24 : 0,75 + 1,62 : 0,75 = 8,32 + 1,68 = 10
![](https://rs.olm.vn/images/avt/0.png?1311)
C1: (6,24+1,26):0,75
=7,5:0,75
=10
C2: (6,24+1,26):0,75
=6,24:0,75+1,26:0,75
=8,32+1,68
=10
\(14,66-1,26-2,66-5,74\)
\(=\left(14,66-2,66\right)-\left(1,26+5,74\right)\)
\(=12-7\)
\(=5\)