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![](https://rs.olm.vn/images/avt/0.png?1311)
a) 25, 7 + 9, 48 + 14, 3
= ( 25, 7 + 14, 3 ) + 9, 48
= 40 + 9, 48
= 49, 48
b) 8, 24 + 3, 69 + 2, 31
= 8, 24 + ( 3, 69 + 2, 31 )
= 8, 24 + 6
= 14, 24
c) 8, 65 + 7, 6 + 1, 35 + 0, 4
= ( 8, 65 + 1, 35 ) + ( 7, 6 + 0, 4 )
= 10 + 8
= 18
d) 5, 92 + 0, 44 + 5, 56 + 4, 08
= ( 5, 92 + 4, 08 ) + ( 0, 44 + 5, 56 )
= 10 + 6
= 16
a 25,7+9,48+14,3
=40+9,48=49,48
b 8,24+3,69+2,31
6+8,2=14,2
c 8,65+7,6+1,35+0,4
10+8+1=19
d 5,92+0,44+5,56+4,08
=10+6=16
![](https://rs.olm.vn/images/avt/0.png?1311)
a. 25,7 + 9,48 + 14,3
= ( 25,7 + 14,3 ) + 9,48
= 40 + 9,48
= 49,48
b. 8,24 + 3,69 + 2,31
= 8,24 + ( 3,69 + 2,31 )
= 8,24 + 6
= 14,24
c. 8,65 + 7,6 + 1,35 + 0,4
= ( 8,65 + 1,35 ) + ( 7,6 + 0,4 )
= 10 + 8
= 18
d. 5,96 + 0,44 + 5,56 + 4,08
= ( 5,96 + 4,08 ) + ( 0,44 + 5,56 )
= 10,04 + 6
= 16,04
e. 7,5 + 6,5 + 5,5 + 4,5 + 3,5 + 2,5
= ( 7,5 + 2,5 ) + ( 6,5 + 3,5 ) + ( 5,5 + 4,5 )
= 10 + 10 + 10
= 30
#Nii
a.25,7 + 9,48 + 14,3 = ( 25,7 + 14,3 ) + 9,48 = 40 + 9,48 = 49,48
b.8,24 + 3,69 + 2,31 = 8,24 + ( 3,69 + 2,31 ) = 8,24 + 6 = 14,24
c.8,65 + 7,6 + 1,35 + 0,4 = ( 8,65 + 1,35 ) + ( 7,6 + 0,4 ) = 10 + 8 = 18
d.5,92 + 0,44 + 5,56 + 4,08 = ( 5,92 + 4,08 ) + ( 0,44 + 5,56 ) = 10 + 6 = 16
e.7,5 + 6,5 + 5,5 + 4,5 + 3,5 + 2,5 = ( 7,5 + 2,5 ) + ( 6,5 + 3,5 ) + ( 5,5 + 4,5 ) = 10 + 10 + 10 = 30
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 25,7 + 9,48 + 14,3 = ( 25,7 + 14,3 ) + 9,48
= 40 + 9,48 = 49,48
b) 8,24 + 3,69 + 2,31 = 8,24 + ( 3,69 + 2,31 )
= 8,24 + 6
= 14,24
c) 8,65 + 7,6 + 1,35 + 0,4 = ( 8,65 + 1,35 ) + ( 7,6 + 0,4 )
= 10 + 8
= 18
d) 5,92 + 0,44 + 5,56 + 4,08 = ( 5,92 + 4,08 ) + ( 0,44 + 5,56 )
= 10 + 6
= 16
e) 7,5 + 6,5 + 5,5 + 4,5 + 3,5 + 2,5 = ( 7,5 + 2,5 ) + ( 6,5 + 3,5 ) + ( 5,5 + 4,5 )
= 10 + 10 + 10
= 30
Đúng 100% luôn đó ,các bn nhớ k nha
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 8,65 + 7,6 + 1,35 + 0,4
= ( 8,65 + 1,35) + ( 7,6 + 0,4 )
= 10 + 8
=18.
b) 5,92 + 0,44 + 5,56 + 4,08
= ( 5,92 + 4,08 ) + ( 0,44 + 5,56 )
= 10 + 6
= 16.
k mik nhé!!
#Học tốt.
\(a.8,65+7,6+1,35+0,4\)
\(=\left(8,35+1,35\right)+\left(7,6+0,4\right)\)
\(=10+8=18\)
\(b.5,92+0,44+5,56+4,08\)
\(=\left(5,92+4,08\right)+\left(0,44+5,56\right)\)
\(=10+6=16\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, (25,7+ 14,3)+9,48= 49.48
b, (3,69+ 2,31)+ 8,24=14,24
c,(8,65+1,35)+(0,4+7,6)=18
d, (5,92+4,08)+(0,44+5,56)=15
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 8,24 + 3,69 + 2,31= 8,24+( 3,69+2,31)= 14,24
b) 8,65 + 7,6 + 1,35 + 0,4= ( 8,65+ 1,35)+(7,6+0,4)= 10+8 = 18
c) 7,5 + 6,5 + 5,5 + 4,5 + 3,5 + 2,5= ( 7,5+6,5)+(5,5+4,5)+(3,5+2,5) =14+10+6+8= 38
![](https://rs.olm.vn/images/avt/0.png?1311)
Tính bằng cách thuận tiện nhất:
8,65+7,6+1,35+0,4=(7,6+0,4)+(8,65+1,35)
=8+10=18
8,24+3,69+2,31=8,24+(3,69+2,31)
=8,24+6
=13,24
Tìm x:
X+362,7=61,8×7,9
X+362,7=488,22
X=488,22-362,7
X=125,52
Biểu thức:
21,537×31,4+42,1×21,537+21,537×26,5
=21,537×(31,4+42,1+26,5)
=21,537×100
=2153,7
\(8,65+7,6+1,35+0,4\)
\(=\left(8,65+1,35\right)+\left(7,6+0,4\right)\)
\(=10+8\)
\(=18\)
\(8,24+3,69+2,31\)
\(=8,24+\left(3,69+2,31\right)\)
\(=8,24+6\)
\(=14,24\)
\(X+362,7=61,8x7,9\)
\(X=61,8x7,9-362,7\)
\(X=488,22-362,7\)
\(X=125,52\)
\(21,537x31,4+42,1x21,357+21,357x26,5\)
\(=21,357x\left(31,4+42,1+26,5\right)\)
\(=21,357x100\)
\(=2135,7\)
Chúc bạn học tốt !!!
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 1:
$539,6+73,495= 613,095$
$247,06+316,492=613,095$
$8,9+9,3+4,7+5=27,9$
$324,8+66,7+208,4=599,9$
Bài 2:
a.
$=(8,65+1,35)+(7,6+0,4)=10+8=18$
b.
$=(5,92+4,08)+(0,44+5,56)=10+6=16$
c.
$=(7,5+2,5)+(6,5+3,5)+(5,5+4,5)=10+10+10=30$
d.
$=(1,2+7,8)+(2,3+6,7)+(3,4+5,6)+4,5=9+9+9+4,5$
$=27+4,5=31,5$