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a) (12,84+5,92) x 13,8= 18,76 x 13,8 = 258,888
b) (98,17 - 43,56)x 5,6 = 63,61 x 5,6 = 356,216
![](https://rs.olm.vn/images/avt/0.png?1311)
\(5,6=5,60=5,600=5,6000\)
\(34,56=34,560=34,5600=34,56000\)
\(35,08=35,080=35,0800=35,08000\)
\(8,900=8,90=8,9=8,9000\)
![](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)
\(x\times34,56-x\times25,56+x=0,1\\ x\times\left(34,56-25,56+1\right)=0,1\\ x\times10=0,1\\ x=0,1:10\\ x=0,01\)
X x 34,56 - X x 25,56 + X x 1 = 0,1
X x ( 34,56 - 25,56 + 1 ) = 0,1
X x 10 = 0,1
X = 0,1 : 10
X = 0,01
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a.=34,56\times\left(6+3+1\right)\)
\(=34,56\times10\)
\(=345,6\)
\(b.=75,18\times\left(34+37+28+1\right)\)
\(=75,18\times100\)
\(=7518\)
Nè tớ thấy đề bài bạn hơi sai sai
Tớ nghĩ:'' a,34,56x6+34,56x3+34,56'' thì đúng hơn
tớ sẽ cho kết quả luôn:
A)258,888
B)356,216
nhớ k cho tớ nhé