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(x-3,64)*2,5=15,85
=>x-3,64=15,85/2,5=6,34
=>x=6,34+3,64=10
52*(y/78)=3380
=>y/78=3380/52
=>y/78=65
=>y=65*78
=>y=5070
![](https://rs.olm.vn/images/avt/0.png?1311)
15,85+2,075.2=15,85+4,15=20
29,64:(1,32+3,48)-0,345:3=29,64:4,8-0,345:3=6,175-0,115=6,06
15,85 + 2,075.2
=15,85 + 4,15
=20
29,64:(1,32 + 3,48) - 0,345:3
=29,64:4,8 - 0,115
=6,175 - 0,115
=6,06
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(76,58+25,44+24,56\)
\(=76,58+\left(25,44+24,56\right)\)
\(=76,58+50\)
\(=126,58\)
______________
b) \(23,43+28,48+21,52+56,57\)
\(=\left(23,43+56,57\right)+\left(28,48+21,52\right)\)
\(=80+50\)
\(=130\)
a) 76,58 + 25,44 + 24,56
= 76,58 + (25,44 + 24,56)
= 76,58 + 50
= 126,58
b) 23,43 + 28,48 + 21,52 + 56,57
= (23,43 + 56,57) + (28,48 + 21,52)
= 80 + 50
= 130
![](https://rs.olm.vn/images/avt/0.png?1311)
a,19,75 x 0,4 x 2,5 b,9,67 x80 x 1,25
=19,75 x 1 =9,67 x 100
=19,75 =967
c,15,85 x 6,85 - 6,85 x 3,5 -2,35 x 6,85 d,1,25 x 0,35 x 0,8 +0,5614 +1,4386
=6,85 x (15,85 - 3,5 - 2,35) =0,35 x (1,25 x 0,8) + (0,5614 + 1,4386)
=6,85 x 10 =0,35 x 1 + 2
=68,5 =0,35 +2
=2,35
a,19,75 x 0,4 x 2,5 b,9,67 x80 x 1,25
=19,75 x 1 =9,67 x 100
=19,75 =967
c,15,85 x 6,85 - 6,85 x 3,5 -2,35 x 6,85 d,1,25 x 0,35 x 0,8 +0,5614 +1,4386
=6,85 x (15,85 - 3,5 - 2,35) =0,35 x (1,25 x 0,8) + (0,5614 + 1,4386)
=6,85 x 10 =0,35 x 1 + 2
=68,5 =0,35 +2
=2,35
20499,092
đung tick nhe ban