tinh nhanh (-27)+20+(-9)+27+(-11)
tính nhanh ( 27 - 11 ) + ( 20 - 9- 27 )
( 27 - 11 ) + ( 20 - 9 - 27 )
= 27 - 11 + 20 - 9 - 27
= (27 - 27) + 20 - (11 + 9)
= 20 - 20 = 0
= (27 - 11) +(20+9-27)
= (27 - 27) + (11+9) +20
= 0 + 20 + 20
= 0+40
=40
Tính nhanh
-175-(-7.5\(^2\)+4.2\(^3\))
(-27)+20+(-9)+27+(-11)
a) -175 - ( -7 . 5^2 + 4 . 2^3)
= -175 - ( -175 + 32 )
= -175 - -175 +32
= 0 +32
= 32
b) (-27) + 20 + (-9) + 27 + (-11)
= (-27 + 27 ) + 20 + (-11) + (- 9)
= 0 + 9 + (-9)
= 0 + 0
= 0
tinh nhanh
7/9-1/6-1/3+4/9-1/2 b) 27/22-14/38+21/11-12/19
Tính nhanh
1/3 + 1/9 + 1/27 + 1/81 + 1/243 + 1/729
9/20 - 11/30 + 13/42 - 15/56 + 17/72 - ........ + 197/9702 - 199/9900
tinh nhanh
a,A=100+98+96+...+2-97-95-...-1
b,B=1+2-3-4+5+6-7-8+9+10-11-12+...-229-330+301+302
c,C=41*66+34*41/3+7+11+...+79
d,D=1+2+3+...+200/6+8+10+...+34
e,E=1*5*6+2*10*12+20*24*4+9*45*54/1*3*5+2*6*10+4*12*20+9*27*45
tinh :3va1/11*27/46*1va6/17*2va4/9
Rút gọn
a) 20 - 12 . 20/ -30 - 30 . 10
b) 11^9 . 3^15 . 27/ 3^10 .11^11. 3^8
Em cố gắng gõ latex nha
a: \(=\dfrac{20\left(1-12\right)}{30\left(-1-10\right)}=\dfrac{2}{3}\)
b: \(=\dfrac{11^9\cdot3^{18}}{3^{18}\cdot11^{11}}=\dfrac{1}{121}\)
Rút gọn
a) 20 - 12 . 20/ -30 - 30 . 10
b) 11^9 . 3^15 . 27/ 3^10 .11^11. 3^8
a: \(=\dfrac{20\left(1-12\right)}{30\left(-1-10\right)}=\dfrac{20}{30}=\dfrac{2}{3}\)
b: \(=\dfrac{11^9\cdot3^{18}}{3^{10}\cdot11^{11}\cdot3^8}=\dfrac{1}{121}\)
Tinh nhanh
99:8-11×27/37+9×22/7
Giup minh nhe cac ban mai minh nop roi