4+(12/15:9/2)x15/16.
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a) \(6x+15\times8=12\times\left(19-x\right)\)
\(6x+120=228-12x\)
\(6x+120-228+12x=0\)
\(18x-108=0\)
\(18x=108\)
\(x=6\)
b) \(160-\left(35\div x+3\right)\times15=15\)
\(160-\left(35\div x+3\right)=1\)
\(35\div x+3=159\)
\(35\div x=156\)
\(x=\dfrac{35}{156}\)
c) \(2x-\left(1309\div11-19\right)-2=0\)
\(2x-1309\div11-19=2\)
\(2x-119-19=2\)
\(2x-119=21\)
\(2x=140\)
\(x=70\)
d) \(\left(x-7\right)\times\left(2x-16\right)=0\)
\(x-7=0;2x-16=0\)
\(x=7;2x=16\)
\(x=7;x=8\)
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( 123 x 345 ) x ( 13 x 15 - 12 x 15 - 15 )
= ( 123 x 345 ) x ( 13 x 15 - 12 x 15 - 15 x 1 )
= ( 123 x 345 ) x ( (13 - 12 -1 ) x 15 )
= ( 123 x 345 ) x ( 0 x 15 )
= ( 123 x 345 ) x 0
= 0
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155 x 153 = 158
212 x 24 = 216
54 x 56 = 510
k cho mk nha
\(15^5\cdot15^3=15^{5+3}=15^8\)
\(2^{12}\cdot2^4=2^{12+4}=2^{16}\)
\(5^4\cdot5^6=5^{4+6}=5^{10}\)
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4.[-2(8:4) + 15(-3) - (-12)]
= 4.[-2.2 - 45 + 12]
= 4.[-4 - 45 + 12]
= 4.[-49 + 12]
= 4.[-37]
= - 148
3.(25 : 5 - 14 : 2) - 5.(6:2)
= 3.(5 - 7) - 5.3
= 3.(-2) - 15
= - 6 - 15
= -21
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B=1x3/2x2x2x4/3x3x3x5/4x4x...x10x12/11x11
B=1x3x2x4x3x5x...x10x12/2x2x3x3x4x4x...x11x11
B=(1x2x3x...x10)x(2x3x5x...x12)/(2x3x4x...x11)x(2x3x4x...x11)
B=1x12/11x2
B=12/22
B=6/11
Vậy B = 6/11
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\(4+\left(\frac{12}{15}:\frac{9}{2}\right)\times\frac{15}{16}\)
\(=4+\left(\frac{4}{5}\times\frac{2}{9}\right)\times\frac{15}{16}\)
\(=4+\frac{8}{45}\times\frac{15}{16}\)
\(=4+\frac{1}{6}\)
\(=4\frac{1}{6}\)
@muối
\(4+\left(\frac{12}{15}:\frac{9}{2}\right)\cdot\frac{15}{16}=4+\left(\frac{4}{5}\cdot\frac{2}{9}\right)\cdot\frac{15}{16}=4+\frac{8}{45}\cdot\frac{15}{16}=4+\frac{2}{3}=\frac{14}{3}\)