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a, 324 489 + 446 357
b, 986 769 – 342 538
c, 287 x 24
d, 13068 : 27
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a)27-x/15=5/3
=>27-x/15=25/15
=>27-x=25
=>x=27-25
=>x=2
Vậy x = 2
b)5+x/7 = 24/21
=>5+x/7=8/7
=>5+x=8
=>x=8-5
=>x=3
Vậy x= 3
27 - \(\frac{x}{15}\) = \(\frac{5}{3}\)
\(\frac{x}{15}\) = 27 - \(\frac{5}{3}\)
\(\frac{x}{15}\) = \(\frac{76}{3}\)
Phần b lm tương tự nha !!
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324 x 20 + 80 x 324 + 324 x 0
= 324 x (20 + 80 + 0 )
=324 x 100
= 32400
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( 12 x 13 + 14 x 15 + ... + 24 x 25 + 26 x 27 ) x ( 14 + 6 - 10 + 5 - 3 x 5 )
= ( 12 x 13 + 14 x 15 + ... + 24 x 25 + 26 x 27 ) x 0
= 0
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A = \(\dfrac{8\times12\times32+4\times27\times24+96\times41}{16\times48-48\times9+4\times3\times12}\)
A = \(\dfrac{96\times32+96\times27+96\times41}{16\times48-48\times9+48\times3}\)
A = \(\dfrac{96\times\left(32+27+41\right)}{48\times\left(16-9+3\right)}\)
A = \(\dfrac{96\times100}{48\times10}\)
A = \(\dfrac{20}{1}\) \(\times\) \(\dfrac{48\times10}{48\times10}\)
A = 20
a. \(x\cdot24\cdot3=936\)
\(x\cdot72=936\)
\(x=13\)
b. \(927\div x\cdot27=324\)
\(927\div x=12\)
\(x=77,25\)
X x 24 x 3 = 936
X x 24 = 936 : 3
X x 24 = 312
X = 312 : 24
x = 13
972 : X x 27 = 324
972 : X = 324 : 27
972 : X = 12
X = 972 : 12
X = 81