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a) Ta có \(\dfrac{72}{95}\times\dfrac{105}{105}=\dfrac{72}{95}\times1=\dfrac{72}{95}=\dfrac{72}{95}\)
Vậy \(\dfrac{72}{95}=\dfrac{72}{95}\times\dfrac{105}{105}\)
b) Ta có \(\dfrac{72}{95}\times\dfrac{99}{98}=\dfrac{72}{95}\times\left(1+\dfrac{1}{98}\right)=\dfrac{72}{95}\times1+\dfrac{72}{95}\times\dfrac{1}{98}=\dfrac{72}{95}+\dfrac{72}{95}\times\dfrac{1}{98}>\dfrac{72}{95}\)Vậy \(\dfrac{72}{95}< \dfrac{72}{95}\times\dfrac{99}{98}\)
a) 72/95 ... 72/95 x 105/105
72/95 ... 72/95 x 1 ( 105/105 = 1 )
72/95 = 72/95 x 105/105
b) 72/95 ... 72/95 x 99/98
72/95 x 1 ... 72/95 x 99/98 ( 99/98 > 1 )
72/95 < 72/95 x 99/98
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a) 95 + 11 x 206
= 95 + 2266 = 2361
b) 95 x 11 + 206
= 1045 + 206 = 1251
c) 95 x 11 x 206
= 1045 x 206 = 215270
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98 x 95 + 95 + 95
= 98 x 95 + 95 x 2
= (98 + 2) x 95
= 100 x 95
= 9500
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Bài này khó vãi . Sao ở trong phép tính còn có tiếng anh nữa .
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a) `1/2 xx 5/4 + 1/2 xx 3/4 + 1/2`
`=1/2 xx (5/4 + 3/4 + 1)`
`=1/2 xx 3`
`=3/2`
b) `72/95 xx 64/72 xx 95/72 xx 14/86 xx 72/64 xx 86/14`
`=(72xx64xx95xx14xx72xx86)/(95xx72xx72xx86xx64xx14)`
`= 1`.
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A) 95.(a-75)=95.(100-75)
=>a-75=100-75
vậy a =100
B) 2003+a.15=2003.10.3.5
a.15=10.3.5
=95+2266=2361