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200,8×11,45-200,8×11,44
=200,8×(11,45-11,44)
=200,8×0,01
=2,008
200,9×13,09-200,9×13,08
=200,9×(13,09-13,08)
200,9×0,01
=2,009
12,36×3,5+12,36×2,4+12,36×4,1
=12,36×(3,5+2,4+4,1)
=12,36×10
=123,6
a)Ta có\(200,8\times11,45-200,8\times11,44\)
\(=200,8\left(11,45-11,44\right)\)
\(=200,8\times0,01\)
\(=2,008\)
b)Ta có:\(200,9\times13,09-200,9\times13,08\)
\(=200,9\left(13,09-13,08\right)\)
\(=200,9\times0,01\)
\(=2,009\)
c)Ta có:\(12,36\times3,5+12,36\times2,4+12,36\times4,1\)
\(=12,36\left(3,5+2,4+4,1\right)\)
\(=12,36\times10\)
\(=123,6\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
39,28 - 11,25: 3 + 12,36: 0,4 - 17,25 x 0,3
= 39,28 - 3,75 + 30,9 - 5,175
= 35,53 + 30,9 - 5,175
= 66,43 - 5,175
= 61,255
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có BC = 15 cm => MH = 15 (cm)
Lại có AB= 330 cm => CD = 330 ( cm)
Diện tích tam giác MDC là :
CD . MH/2 = 330 . 15/2 =2475 ( cm2 )
Tính diện tích AEG bằng 2 cách
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) x.17,57 = 415,25 - 15,25
\(\Rightarrow\)x17,57 = 400
\(\Rightarrow\)x = 400 : 17,57
\(\Rightarrow\)x = 22,76607854
vậy x = 22,76607854
b) 12,36 . x - 29,6 = 81,84
\(\Rightarrow\)12,36x = 81,84 + 19,6 = 111,44
\(\Rightarrow\)x = 111,44 : 12,36
\(\Rightarrow\)9,01618123
vậy x = 9,01618123
chúc bạn học tốt !
\(x\times17,57=415,25-15,25\)
\(x\times17,57=400\)
\(x=400\div17,57\)
\(x=\frac{40000}{1757}\)
vậy \(x=\frac{40000}{1757}\)
chúc bạn học tốt
12,36 \(\times\) y + y + 16,64 \(\times\) y = 302
12,36 \(\times\) y + y \(\times\) 1 + 16,64 \(\times\) y = 302
y \(\times\) ( 12,36 + 1 + 16,64) = 302
y \(\times\) 30 = 302
y = 302 : 30
y = \(\dfrac{151}{15}\)