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Bài 2: Tính giá trị biểu thức:
23 + 37 - 21
= 60 - 21
= 39
23 - 4 + (40 x 5) -31
= 23 - 4 + 200 -31
= 19 + 169
= 188
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a: \(=\dfrac{7\left(145+55\right)}{6\left(315+35\right)}=\dfrac{7}{6}\cdot\dfrac{200}{350}=\dfrac{7}{6}\cdot\dfrac{4}{7}=\dfrac{2}{3}\)
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`#3107.101107`
\(\dfrac{7^{40}\cdot5-7^{39}\cdot8}{7^{39}\cdot3^3}\)
\(=\dfrac{7^{39}\cdot\left(7\cdot5-8\right)}{7^{39}\cdot3^3}\\ =\dfrac{7\cdot5-8}{3^3}\\ =\dfrac{35-8}{27}\\ =\dfrac{27}{27}\\ =1\)
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\(\dfrac{6x25x42}{5x7x15}\)
= \(\dfrac{2x3x5x5x6x7}{5x7x3x5}\)
= 12.
1. \(\dfrac{3x2x14}{4x7x19}\)
= \(\dfrac{3x2x7x2}{2x2x7x19}\)
= 3/19.
![](https://rs.olm.vn/images/avt/0.png?1311)
a)5/12+25/3x1/4=5/12+25/12=5/2
b)8X3333X54/2424=1439856/2424=594
C)12/5-2/5X25/6=12/5-5/3=11/15
TL:
5 x 25 = 125
5 x 35 = 185
40 x 5 = 200
HT
nhầm nhé
5 x 35 = 175