x+65*2=130
Tính
65/2+(-65/3) - 130/3
Tính nhanh:
65 x 42 - 130 x 21 + 1998
65x42-130x21+1998
=65x (2x21)-130x21+1998
=(65x2)x21-130x21+1998
=130x21-130x21+1998
=0+1998
=1998
tìm x thuộc Z(x^3+7)(x^3+12)(x^3+65)(x^3+130)<0
giúp mik với
tìm x thuộc z biet (x ^3+7).(x^+12).(x^3+65).(x^3+130)<0
Tính:
a) \(72.19 - 36^2:18\);
b) 750 : {130 - [(5. 14 - 65)3 + 3}}.
a)\(72.19 - 36^2:18= 72.19- 36.36:18\)
\(=72.19 - 72=72.(19 - 1)\)
\(=72.18=1296\)
b)
\(\begin{array}{l}750{\rm{ }}:{\rm{ }}\left\{ {130{\rm{ }} - {\rm{ }}[{{\left( {5.{\rm{ }}14{\rm{ }} - {\rm{ }}65} \right)}^3} + {\rm{ }}3} \right\}\\ = 750{\rm{ }}:{\rm{ }}\left\{ {130{\rm{ }} - {\rm{ }}\left[ {{{\left( {{\rm{70 }} - {\rm{ }}65} \right)}^3} + {\rm{ }}3} \right]} \right\}\\ = 750{\rm{ }}:{\rm{ }}\left\{ {130{\rm{ }} - {\rm{ }}\left[ {{5^3} + {\rm{ }}3} \right]} \right\}\\ = 750{\rm{ }}:{\rm{ }}\left\{ {130{\rm{ }} - {\rm{ }}\left[ {125 + {\rm{ }}3} \right]} \right\}\\ = 750{\rm{ }}:{\rm{ }}\left\{ {130{\rm{ }} - {\rm{ 128}}} \right\}\\ = 750:2 = 375.\end{array}\)
tìm x thuộc z biet (x ^3+7).(x^+12).(x^3+65).(x^3+130)
ai lam dung mk tk cho nhe
tìm x thuộc z (x^3+7).(x^3+12).(x^3+65).(x^3+130)<0
ai đúng mk tk cho nhé(:)A,B,C,D
x≥-2; or ≤-6(loai)
all (+) and (-)
x=-3; only A(-)==> yes
x=-4 (A,B(-); CD(+)=> no
x=-5( 0nly D(+)--> yes
x={-3;-5}
Tìm x thuộc Z
( x3 +7 )(x3 +12)(x3+65)(x3+130) <0
13x - 130 = 65
13x - 130 = 65
=> 13x = 65 + 130
=> 13x = 195
=> x = 195 : 13
=> x = 15
Vậy x = 15
13x - 130 = 65
13x = 65 + 130
13x = 195
x = 195 : 13
x = 15