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75,8 + 249,19 = 324,99
60 – 12,45 = 47,55
16,25 x 6,7 = 108,875
75,32 : 2 = 37,66
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 4,37 x 4 x 2,5
=4,37x(4x2,5)
=4,37x10
=43,7
b) 12,45 x 95 + 12,45 x 4 + 12,45
=12,45 x 95 + 12,45 x 4 + 12,45 x 1
=12,45 x (95+4+1)
=12,45 x 100
=1245
![](https://rs.olm.vn/images/avt/0.png?1311)
\(16,34-12,45+8,45\\ =16,34-\left(12,45-8,45\right)\\ =16,34-4\\ =12,34\)
16,34 - 12,45 + 8,45
= 16 + 0,34 - 12 - 0,45 + 8 + 0,45
= 16 + 0,34 -12 + 8
= 12,34
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
A= 12,45x7,8+12,45x92,2
= 12,45x(7,8+92,2)
=12,45x100
=1245
B=25,89x75,2-25,89x65,2
=25,89x(75,2-65,2)
=25,89x10
=258,9
C=34,56x23,9-34,56x12,4+11,5x65,44
=34,56x(23,9-12,4)+11,5x65,44
=34,56x11,5+11,6x65,44
=11,5x(34,56+65,44)
=11,5x100
=1150
\(A=12,45.7,8+12,45.92,2\)
\(A=12,45.\left(7,8+92,2\right)\)
\(A=12,45.100\)
\(A=1245\)
\(B=25,98.75,2-25,89.65,2\)
\(B=25,89.\left(75,2-65,2\right)\)
\(B=25,89.10\)
\(B=258,9\)
\(C=34,56.23,9-34,56.12,4+11,5.65,44\)
\(C=34,56.\left(23,9-12,4\right)+11,5.65,44\)
\(C=34,56.11,5+11,5.65,44\)
\(C=11,5.\left(34,56+65,44\right)\)
\(C=11,5.100\)
\(C=1150\)
![](https://rs.olm.vn/images/avt/0.png?1311)
TL :
\(60-12,45=47,55\)
HT
@@@@@@@@@@@@@@@
60-12,45=47,55
~~HT~~~