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Tính hợp lý:
2 x 144 x 18 + 4 x 41 x 9 + 3 x 15 x 12=?
Help me! Mình đang cần ngay trong ngày hôm nay!
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2 x 144 x 18 + 4 x 41 x 9 + 3 x 15 x 12
=36x144+36x41+36x15
=36x(144+41+15)
=36x200
=7200
HT
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a)x-3/4=5/12 : 10/3
x-3/4= 1/8
x = 1/8 + 3/4
x = 7/8
b)7/6 - x=3/5 x 15/18
7/6 - x = 1/2
x = 7/6 - 1/2
x = 2/3
a)x-3/4=5/12 : 10/3
x-3/4= 1/8
x = 1/8 + 3/4
x = 7/8
b)7/6 - x=3/5 x 15/18
7/6 - x = 1/2
x = 7/6 - 1/2
x = 2/3
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\((\)125-120\()\)x45
5x45=225
\(\dfrac{30x25x7x8}{75x8x12x14}\)=\(\dfrac{10\cdot1\cdot7\cdot1}{1\cdot1\cdot1\cdot12\cdot2}\)=\(\dfrac{70}{24}\)
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500x6+500x4-108:12:9
=500x(6+4)-9:9
=500x10-1
=5000-1
=4999
9782x35-9782x25+1000:5:2
=9782x(35-25)+200:2
=9782x10+100
=97820+100
=97920
37800:25:4+57+467x43
=1512:4+57+20081
=378+57+20081
=435+20081
=20516
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a, \(\dfrac{5\times11\times15\times18}{6\times15\times22\times10}\)
= \(\dfrac{5\times11\times15\times6\times3}{6\times15\times11\times2\times2\times5}\)
= \(\dfrac{5\times11\times15\times6}{5\times11\times15\times6}\) \(\times\) \(\dfrac{3}{2\times2}\)
= 1 \(\times\) \(\dfrac{3}{4}\)
= \(\dfrac{3}{4}\)
b, \(\dfrac{7}{12}\) \(\times\) \(\dfrac{3}{5}\) + \(\dfrac{3}{5}\) \(\times\) \(\dfrac{5}{12}\)
= \(\dfrac{3}{5}\) \(\times\) ( \(\dfrac{7}{12}+\dfrac{5}{12}\))
= \(\dfrac{3}{5}\) \(\times\) \(\dfrac{12}{12}\)
= \(\dfrac{3}{5}\) \(\times\) 1
= \(\dfrac{3}{5}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a)75:x-57:x=6\)
⇔ \(\left(75-57\right):x=6\)
⇔ \(18:x=6\)
⇔ \(x\) \(=3\)
Vậy x = 3
\(b)18:x+12:x-6:x=4\)
⇔ \(\left(18+12-6\right):x=4\)
⇔ \(24:x=4\)
⇔ \(x=6\)
Vậy x = 6
a) 75 : x - 57 : x = 6
⇔ ( 75 - 57 ) : x = 6
⇔ 18 : x = 6
⇔ x = 18 : 6 = 3
Vậy x = 3.
b) 18 : x + 12 : x - 6 : x = 4
⇔ ( 18 + 12 - 6 ) : x = 4
⇔ 24 : x = 4
⇔ x = 24 : 4 = 6.
Vậy x = 6.