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a) 5,6 x 4 + 5,6 x 3 + 5,6 x 2 + 5,6
=\(5,6.\left(4+3+2+1\right)\)
\(=5,6.10\)
\(=56\)
b) 7,89 x 54 - 7,89 x 52 - 7,89
=\(7,89.\left(54-52-1\right)\)
\(=7,89.1\)
\(=7,89\)
CHÚc bạn học tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 5,6 x 4 + 5,6 x 2 + 5,6
= 5,6 x ( 4 + 3 + 2 + 1 )
= 5,6 x 10
= 56
b) 7,89 x 5 - 7,89 x 52 - 7,89
= 7,89 x ( 5 - 52 - 1 )
= 7,89 x ( - 48 )
= - 378,72
![](https://rs.olm.vn/images/avt/0.png?1311)
\(7,89.54-7,89.52-7,89\)
\(=7,89\left(54-52-1\right)\)
\(=7,89.1\)
\(=7,89\)
\(5,6.4+5,6.2+5,6\)
\(=5,6\left(4+2+1\right)\)
\(=5,6.7\)
\(=39,2\)
7,89 x 54 - 7,89 x 52 - 7,89
= 7,89 x (54 - 52 - 1)
= 7,89 x 1
= 7,89.
5,6 x 4 + 5,6 x 2 + 5,6
= 5,6 x (4 + 2 + 1)
= 5,6 x 7
= 39,2
![](https://rs.olm.vn/images/avt/0.png?1311)
b) 1+4+7+10+...+52+55+58-440
+tính :1+4+7+10+....+52+55+58
Số các số hạng = (58- 1):3+1=20 (số )
Tổng : =(58+1).20:2=780
+tính :1+4+7+....+52+55+58-440
780-440=340
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(=5,6\cdot\left(4+3+2+1\right)\\ =5,6\cdot10=56\)
b) \(=5\)
a)5,6 x 4 + 5,6 x3 + 5,6 x 2 + 5,6
=5,6x(4+3+2+1)
=5,6x10
=56
b) =5
![](https://rs.olm.vn/images/avt/0.png?1311)
\(5,6\cdot7,5-5,6\cdot4,5+5,6-3\cdot5,6\)
\(=5,6\left(7,5-5,6+1-3\right)\)
\(=5,6\cdot\left(-0,1\right)\)
\(=-0,56\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(0,336\times X:0,35=0,6\)
\(\Rightarrow0,336\times X=0,6\times0,35\)
\(\Rightarrow0,336\times X=0,21\)
\(\Rightarrow X=0,336:0,21\)
\(\Rightarrow X=1,6\)
\(5,6\times4+5,6\times3+5,6\times2+5,6\)
\(=5,6\times4+5,6\times3+5,6\times2+5,6\times1\)
\(=5,6\times\left(4+3+2+1\right)\)
\(=5,6\times10=56\)
![](https://rs.olm.vn/images/avt/0.png?1311)
5,6 x 4 + 5,6 x 3 + 5,6 x 2 + 2,8 + 2,8
= 5,6 x 4 + 5,6 x 3 + 5,6 x 2 + 5,6
= 5,6x(4+3+2+1)
=5,6 x 10
=56
Tick mik nha!!
`(52-x):3=5,6`
`52-x=5,6xx3`
`52-x=16,8`
`x=52-16,8`
`x=35,2`
\(\left(52-x\right):3=5,6\\ 52-x=5,6\times3\\ 52-x=16,8\\ x=52-16,8\\ x=35,2\)