Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(P=\dfrac{32}{64}\cdot\dfrac{-57}{19}+\dfrac{35}{21}\cdot\dfrac{22}{44}=\dfrac{1}{2}\left(-3+\dfrac{5}{3}\right)=\dfrac{1}{2}\cdot\dfrac{-4}{3}=\dfrac{-2}{3}\)
\(Q=\dfrac{75}{125}\cdot\dfrac{82}{164}+\dfrac{49}{98}\cdot\dfrac{-35}{105}=\dfrac{1}{2}\left(\dfrac{3}{5}-\dfrac{1}{3}\right)=\dfrac{1}{2}\cdot\dfrac{4}{15}=\dfrac{2}{15}\)
\(a,12-\left(4+105-13\right)+\left(4+105-3\right)\)
\(=12-4-105+13+4+105-3\)
\(=12+\left(-4+4\right)+\left(-105+105\right)+\left(13-3\right)\)
\(=12+0+0+10\)
\(=22\)
\(b,-15+\left(-17+21-35\right)+\left(4+105-13\right)\)
\(=-15-17+21-35+4+105-13\)
\(=\left(-15-35\right)+\left(-17-13\right)+\left(21+4+105\right)\)
\(=-50-30+130\)
\(=-50+100\)
\(=50\)
\(c,\left(\left|-5\right|+\left|+7\right|+\left|-9\right|\right)-\left(\left|+5\right|+\left|-7\right|+9\right)\)
\(=\left(5+7+9\right)-\left(5+7+9\right)\)
\(=0\)
-55 . 75 + 13 (-75) . (-32)
= 20 + 13 (-43)
= 33 + (-43)
= -10
Hk tốt,
k nhé
a, 60 = 2 2 . 3 . 5 ; 225 = 3 2 . 5 2
BCNN(60;225) = 2 2 . 3 2 . 5 2 = 900
b, 18 = 2 . 3 2 ; 75 = 3 . 5 2
BCNN(18;75) = 2 . 3 2 . 5 2 = 450
c, 45 = 3 2 . 5 ; 105 = 3 . 5 . 7
BCNN(45;105) = 3 2 . 5 . 7 = 315
d, BCNN(100;147) = 100.147 = 14700
a) ( x - 15 ) - 75 = 0
x - 15 = 75
x = 75 + 15
x = 90
Vậy x = 90
b) 575 - ( 6x + 70 ) = 445
6x + 70 = 575 - 445
6x + 70 = 130
6x = 60
x = 10
Vậy x = 10
c) 315 + ( 125 - x ) = 435
125 - x = 120
x = 125 - 120
x = 5
Vậy x = 5
d) x - 105 : 21 = 15
x - 5 = 15
x = 20
Vậy x = 20
e) ( x - 105 ) : 21 = 1
x - 105 = 21
x = 21 + 105
x = 126
Vậy x = 126
105+(75-105)-(-100+75)
=105+75-105+100-75
=(105-105)+(75-75)+100
=0+0+100
=100
= 105 +(75 -105 ) - (100 + 75)
=105 + 75 - 105 + 100 - 75
= (105 - 105 ) + (75 -75) +100
=0 + 0 + 100
=100
CHÚC BN HOK TỐT NHỚ K VHO MIK NHÉ~~~~