9 x 78
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X x 9 + X x 2 - X x 3 - X - 20 = 78
X x ( 9 + 2 - 3 - 1 ) - 20 = 78
X x 7 = 78 + 20
X x 7 = 98
X = 98 : 7
X = 14
Ai k mình mình k lại cho 3 k
![](https://rs.olm.vn/images/avt/0.png?1311)
378 x 24352 = 378 x ( 35 )52 = 378 x 3260 = 3338
9101 x 2778 = ( 32 )101 x ( 33 )78 = 3202 x 3234 = 3436
Vì 338 < 436
=> 3338 < 3436
=> 378 x 24352 < 9101 x 2778
Ta có:
\(3^{78}\times243^{52}=3^{78}\times\left(3^5\right)^{52}=3^{78}\times3^{260}=3^{338}\)
\(9^{101}\times27^{78}=\left(3^2\right)^{101}\times\left(3^3\right)^{78}=3^{202}\times3^{234}=3^{436}\)
Vì \(3^{338}< 3^{436}\)
\(\Rightarrow3^{338}< 3^{436}\)
\(\Rightarrow3^{78}\times243^{52}< 9^{101}\times27^{78}\left(đpcm\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
`@` `\text {Ans}`
`\downarrow`
`2023 \times 14 + 2023 \times 83+97`
`= 2023 \times (14+83) + 97`
`= 2023 \times 97 + 97`
`= 196231 +97`
`= 196328`
`78 \times 31+78 \times 24+78 \times 17+78 \times 22 \times 72`
`= 78 \times (31+24+17+22 \times 72)`
`= 78 \times (31+24+17+1584)`
`= 78 \times 1656`
`= 129168`
`371 \times 69+371 \times 14+629 \times 83`
`= 371 \times (69+14) + 629 \times 83`
`= 371 \times 83 + 629 \times 83`
`= 83 \times (371+629)`
`= 83 \times 1000`
`= 83000`
`91 \times 51+49 \times 163-49 \times 72`
`= 91 \times 51 + 49 \times (163-72)`
`= 91 \times 51+49 \times 91`
`= 91 \times (51+49)`
`= 91 \times 100`
`= 9100`
`3 \times 12 \times 17 + 4 \times 9 \times 81 + 2 \times 6 \times 6`
`= 9 \times 4 \times 17 + 4 \times 9 \times 81 + 4 \times 9 \times 2`
`= 9 \times 4 \times (17+81+2)`
`= 36 \times 100`
`= 3600`
`42 \times 17 + 58 \times 83 \times 42 \times 83 + 42 \times 83 + 17`
`= 17 \times (42+58) + 42 \times 83 \times (58 \times 83 +1)`
`= 17 \times 100 + 3486 \times 4815`
`= 1700 + 16785090`
`= 16786790`
![](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)
(3x - 9) - 12 = 78
3x - 9 = 78 + 12
3x - 9 = 90
3x = 90 + 9
3x = 99
x = 33
huynh ngoc minh tuan 99 sao lai bang =33 ???????????????????
![](https://rs.olm.vn/images/avt/0.png?1311)
\(9^{x-1}=9\)
\(9^{x-1}=9^1\)
\(x-1=1\)
\(x=1+1\)
\(x=2\)
\(\frac{6x-18}{3}+25\times2=78\)
\(\frac{6\left(x-3\right)}{3}+50=78\)
\(2\left(x-3\right)=78-50\)
\(2x-6=28\)
\(2x=28+6\)
\(2x=34\)
\(x=\frac{34}{2}\)
\(x=17\)
a) \(9^{x-1}=9\)
\(\Rightarrow x-1=1\)
\(\Rightarrow x=2\)
Vậy \(x=2\)
b) \(\left(6x-18\right):3+25.2=78\)
\(\Rightarrow3\left(2x-6\right):3+50=78\)
\(\Rightarrow2x-6=38\)
\(\Rightarrow2x=44\)
\(\Rightarrow x=22\)
Vậy \(x=22\)
9 x 78 = 702.
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702 nhé
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