48 x X -96 = 4800
96 x 4,2 + 48 x 4, 4 + 96 x 3,6
\(=96\left(4.2+3.6+2.2\right)=96\cdot10=960\)
48 x 27 + 48 +96 x 36
Điền Đ hoặc S
a) 96 : 4 x 2 = 24 x 2 = 48
b) 96 : 4 x 2 = 96 : 8 = 12
c) 96 : (4 x 2 ) = 96 : 8 = 12
Điền Đ, S
a. 96 : 4 x 2 = 24 x 2
= 48
b. 96 : 4 x 2 = 96 : 8
= 12
864 x 48 -432 x 96
_______________
864 : 48 x 432
432 x 2 x 48 - 432 x 96
___________________
432 x 2 : 48 x 432
432 x 96 - 432 x 96
= __________________
432 : 24 x 432
432 x ( 96 - 96 )
=______________
432 : 24 x 432
0
=_______________
432 : 24 x 432
=0
Tính bằng cách thuận tiện nhất:
48 x 27 + 48 + 96 x 36
48 x 27 + 48 + 96 x 36
= 48 x (27 + 1) + 48 x 72
= 48 x 28 + 48 x 72
= 48 x (28 + 72)
= 48 x 100
= 4800 .
\(\dfrac{4800}{x}-\dfrac{4800}{x+100}=8\)
giải pt
ĐK: ` x\ne 0; x \ne -100`
`4800/x-4800/(x+100)=8`
`<=>1/x-1/(x+100) =1/600`
`<=> (x+100-x)/(x(x+100) = 1/600`
`<=> 100/(x(x+100))=1/600`
`<=> x^2+100x = 60000`
\(\left[{}\begin{matrix}x=200\\x=-300\end{matrix}\right.\)
Vậy...
`4800/x-4800/(x+10)=8`
`ĐK:x ne 0,x ne -10`
`pt<=>600/x-600/(x+10)=1`
`<=>(600x+6000-600x)/(x^2+10x)=1`
`<=>6000/(x^2+10x)=1`
`<=>x^2+10x=6000`
`<=>x^2+10x-6000=0`
`Delta'=25+6000=6025`
`<=>x_1=20,x_2=-30`
36 x 48/96 x 72
Tính nhanh:
8 x 12 x 32 + 4 x 27 x 24 + 96 x 41/16 x 48 - 48 x 9 + 4 x 3 x 12.
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