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30 giây trước (16:23)
1 + 1 = 2
9 - 6 = 3
15 + 38 = 53
9 : 3 = 3
9 - 125 = -116
(-125) + 65 = 60
95 - (-37) = 95+37=132
\(\frac{15^9.16^4}{12^9.125^3}=\frac{\left(3.5\right)^9.\left(2^4\right)^4}{\left(3.4\right)^9.\left(5^3\right)^3}=\frac{3^9.5^9.2^{16}}{3^9.4^9.5^9}=\frac{2^{16}}{4^9}=\frac{2^{16}}{\left(2^2\right)^9}=\frac{2^{16}}{2^{18}}=\frac{1}{4}\)
a) (125 -679 + 145 ) - ( 125 - 679 )=125 -679+145-125+679=145
b)(x - 29 ) - ( 17 - 38 ) = -9
<=> x-29 -17+38=-9
<=>x=-1
c)( x + 5 ) + ( x - 9 ) = x + 2
<=>x+5+x-9=x+2
<=>x+x-x=2+9-5
<=>x=6
d) ( 27 - x )+ ( 15 + x ) = x - 24
<=> 27-x+15+x-x=-24
<=> -x=-66
<=>x=66
e) -359 + 181 + ( -123 ) + 350 + ( -172 ) = (181 +350)-(359+172) -123 =531-531-123=-123
f) 13 - 12 + 11 + 10 - 9 + 8 - 7 -6 + 5 - 4 + 3 + 2 -1=( 13 - 12) +11 + (10 - 9)+(8-7)-6+(5-4)+3+(2-1)=1+11+1+1-6+1+3+1=13
a, (125 -679 + 145 ) - ( 125 - 679 )
= 125 - 679 + 145 - 125 + 679
= ( 125 - 125 ) + ( -679 + 679 ) + 145
= 0 + 0 +145
= 145
b, (x - 29 ) - ( 17 - 38 ) = -9
x - 29 - 17 + 38 = -9
x - 29 - 17 = -9 - 38
x - 29 - 17 = -47
x - 29 = -47 + 17
x - 29 = -30
x = -30 + 29
x = -1
Vậy x = -1
c, ( x + 5 ) + ( x - 9 ) = x + 2
x + 5 + x - 9 = x + 2
x - x + 14 = x + 2
14 = x + 2
x = 14 - 2
x = 12
Vậy x = 12
d, ( 27 - x )+ ( 15 + x ) = x - 24
27 - x + 15 + x = x - 24
42 + ( -x + x ) = x - 24
42 = x - 24
x = 24 + 42
x = 66
Vậy x = 66
e, -359 + 181 + ( -123 ) + 350 + ( -172 )
= ( -359 + 350 ) + [ 181 + ( -172 ) ] + ( -123)
= (-9) + 9 + ( -123 )
= 0 + ( -123)
= (-123)
g , 13 - 12 + 11 + 10 - 9 + 8 - 7 -6 + 5 - 4 + 3 + 2 -1
= ( 13 - 12 ) + ( 10 - 9 ) + ( 8 - 7 ) + ( 5 - 4 ) + ( 2 - 1 ) + ( 11 - 6 + 3)
= 1 + 1 + 1 + 1 + 1 + 8
= 1. 5 + 8
= 5 + 8
= 13
C =[125.(73-75)]:(-25)2
=125.(-2):(-25).2
=-250:(-50)
=5
E=125.9.(-4).(-8).25.7
=125.(-8).25.(-4).7.9
=-1000.(-100).63
=6300000
C = ( 125 . 73 - 125 . 75 ) : ( -50)
C = 125 .( -2 ) : (-50)
C = -250 : -50
C = 50
G = ( -3 )2+( -5)3: l -5 l
G = 9 + ( -125) : 5
G = 9 + ( -25 )
G= ( -16 )
E = 125 .9.*( -4 ) . ( -8) .25.7
E = 25.5 .( -4 ) .9 .2. ( -4 ) .25 .7
E =( -100 ).10.( -100).63
E = 10000.630
E = 630000
**** mha
-1125
-1125