Tinh nhanh
27x(13+5)+18(59+14)
Tinh nhanh
27x(13+5)+18(59+14)
27 . ( 13 + 5) + 18 . ( 59 + 14 ) tính nhanh
\(27\cdot\left(13+5\right)+18\cdot\left(59+14\right)\)
\(=27\cdot18+18\cdot73\)
\(=18\cdot\left(27+73\right)\)
\(=18\cdot100\)
\(=1800\)
\(27. \left(13+5\right)+18.\left(59+14\right)\)
\(=27.18+18.73\)
\(=18.\left(27+73\right)\)
\(=18.100\)
\(=1800\)
27.(13+5)+18.(59+14)
=27.18+18.73
=18.(27+73)
=18.100
=1800
tinh bang cach thuan tien nhat
59/18 + 75/14 + 46/9 + 5/2 + 47/18 + 15/7
Lay (59/18 + 46/9) + (75/14 + 15/7) + (5/2 + 47/18)
De et a
tính giá trị biểu thức:
D=13 x 4^6 x ( 28 và 7 phần 13 - 27 và 5 phần 18) / 59 x 2^12 x ( 5 phần 14 + 5 phần 84 + 5 phần 204 + 5 phần 374 ).
Tính nhanh:
a)4.7.25+2.6.5 b)164.53+47.164
c)427+354+373+246+155
d)27.(13+5)+18(59+14)
a, 4.7.25 + 2.6.5 = (4.25)7 + (2.5)6
= 100.7 + 10.6 = 700 + 60 = 760
b, 164.53 + 47.164 = 164( 53 + 47) = 164 . 100 = 16400
c, 427 + 354 + 373 + 246 + 155 = ( 427 + 373 ) + ( 354 + 246 ) + 155
= 800 + 600 + 155 = 1400 + 155 = 1555
d, 27.(13 + 5) + 18(59 + 14) = 27 . 18 + 18. 73
= 18(27 + 73) = 18. 100 = 1800
Chúc bạn học tốt! ~
a) 4.7.25+2.6.5
= (4.25).7+(2.5).6
= 100.7+10.6
= 700+60 = 760
b) 164.53+47.164
= 164.(53+47)
= 164.100 = 16400
c) 427+354+373+246+155
= (427+373)+(354+246)+155
= 800+600+155
= 1400+155 = 1555
d) 27.(13+5)+18.(59+14)
= 27.18+18.73
= 18.(27+73)
= 18.100 = 1800
a)4.7.25+2.6.5
=(4.25).7+(2.5).6
=100.7+10.6
=700+60
=760
b)164.53+47.164
=164.(53+47)
164.100
16400
c)427+354+373+246+155
=(427+373)+(354+246)+155
=800+600+155
=1400+155
=1555
d)27.(13+5)+18.(59+14)
=27.18+18.73
=18.(27+73)
=18.100
=1800
Tinh bang cach thuan tien :
41 / 27 x 13 / 18 - 13 / 18 x 14 / 27
41 / 27 x 13 / 18 - 13 / 18 x 14 / 27 = ( 41 / 27 - 14 / 27 ) x 13 / 18 = 27 / 27 x 13 / 18 = 1 x 13 / 18 = 13 / 18
a) 57+58+59+60+61-17-18-19-20-21
b) 9-10+11-12+13-14+15-16
c) -1-2-3-4-5-.....-1999-2000-2001-2002
tính:
a.(45-3^3)*9-20 b.(59-13)/2-3^2
c.18*2^2/4 d.5^2*7+(14-2)
tinh nhanh
1+2+3+4+5+6+7+8+9+11+12+13+14+15+16+17+18+19
1+2+3+4+5+6+7+8+9+11+12+13+14+15+16+17+18+19
=(1+19)+(2+18)+(3+17)+(4+16)+(5+15)+(6+14)+(7+13)+(8+12)+(9+11)
=20+20+20+20+20+20+20+20+20
=20x9
=180
\(1+2+3+4+5+6+7+8+9+11+12+13+14+15+16+17+18+19\)
\(=\left(1+19\right)+\left(2+18\right)+\left(3+17\right)+\left(4+16\right)+\left(5+15\right)+\left(6+14\right)+\left(7+13\right)+\left(8+12\right)+\left(9+11\right)\)\(=20+20+20+20+20+20+20+20+20\)
\(=20\times9\)
\(=180\)
1+2+3+4+5+6+7+8+9+11+12+13+14+15+16+17+18+19
=(1+19)+(2+18)+(3+17)+(4+16)+(5+15)+(6+14)+(7+13)+(8+12)+(9+11)
=20+20+20+20+20+20+20+20+20
=20x9
=180