Tính nhanh: 2015*9 - 2015*3 - 2015*6
B1: Tính nhanh
a/ A = 3+6+9+.....+999
b/ B = 3737x 83 - 8383 x 37 + 2015
a, A=333(999+3):2=166833\
b, B=3737x83-8383x37+2015
=37x101x83-8383x37+2015
=8383x37-8383x37+2015
=0+2015
=2015
B1 :
Số hạng tử của A là
(999 - 3 ):3 + 1 = 333 (hạng tử)
A = 3 + 6 + 9 ... + 999
A = (3 +999) + (6 + 996) + ...
A = 1002 +1002 +.. + 1002
A = 1002 . 333 :2 = 166833
b/ B = 37 x101 x 8 3 + 83x 1 01x37 + 2015 = 2015
a, A=333(999+3):2=166833\
b, B=3737x83-8383x37+2015
=37x101x83-8383x37+2015
=8383x37-8383x37+2015
=0+2015
=2015
Thực hiện phép tính (tính nhanh nếu có thể)
(-4)6.95-(-6)9.120.12015/ 84.312 - 611.20160
\(\frac{\left(-4\right)^6.9^5-\left(-6\right)^9.120.1^{2015}}{8^4.3^{12}-6^{11}.2016^0}=\frac{\left(2^2\right)^6.\left(3^2\right)^5+\left(2.3\right)^9.2^3.3.5.1}{\left(2^3\right)^4.3^{12}-\left(2.3\right)^{11}.1}=\frac{2^{12}.3^{10}+2^{12}.3^{10}.5}{2^{12}.3^{12}-2^{11}.3^{11}}\)
\(=\frac{2^{12}.3^{10}.\left(1+5\right)}{2^{11}.3^{11}.\left(2.3-1\right)}=\frac{2.6}{3.5}=\frac{4}{5}\)
\(\frac{\left(-4\right)^6.9^5-\left(-6\right)^9.120.1^{2015}}{8^4.3^{12}-6^{11}.2016^0}=\frac{\left(-2\right)^{12}.3^{10}+2^{12}.3^{10}.5}{2^{12}.3^{12}-2^{11}.3^{11}}=\frac{2^{12}.3^{10}.\left(1+5\right)}{2^{11}.3^{11}.\left(2.3-1\right)}=\frac{2.6}{3.5}=\frac{4}{5}\)
1. Tính nhanh
a) 223344 x 36 + 44688 x 82
b) 1 + 2 + 3 + ... + 2015 + 2016
2. So sánh A và B
với A = 2014 x 2016
với B = 2015 x 2015
Help me :<
tính nhanh
A=1+3-5+7-..........-2013+2015
B=1-2+3-4+...................2015-2016
C=1-2-3+4+5-6-6+8+...........+2013-2014-2015+2016
D=1-4+7-10+.....-2014+2017
E=1+2-3-3+5+6 -.......+2013+2014-2015-2016
F=1-2+3-4+..........+2015+2016
G=1+3-5-7+9+11.............-2013-2015
H=1-2-34+5-6-7+8+.................+1013-1014-1015+1016
chị kết bạn với em nha gửi lời kết bn với em nhé
2015 × 8 + 9 × 2015 – 2015 × 6 – 2015 =?
Tính nhanh
2015*3+2015*6+2015=
2016*111-11*2016=
Tính nhanh nha các bạn hi
= 2015 x ( 3 + 6 + 1 )
= 2015 x 10
= 20150
2016 x ( 111 - 11 )
= 2016 x 100
= 201600
tk mình nhé
thank you very much
bye bye
2015x3+2015x6+2015
= 2015 x ( 3+6+1 )
= 2015 x 10
= 20150
2016x111-11x2016
= 2016 x ( 111-11)
= 2016x100
= 201600
2015*3 + 2015*6+ 2015 2016* 111- 11* 2016
=2015*( 3+6+1) = 2016*( 111-11)
=2015* 10 = 2016* 100
= 20150 = 201600
tk cho mk nhe
tính nhanh:
a:3/1x4 +3/4x7+3/7x10+3/10x13+3/13x16+3/16x19+3/19x22
b: 2015/2016x1/2017+2015/2016:2017/2016+1/2016
ai nhanh mk tick
trong ngày mai và tối nay
Tính nhanh
a) 2015 x 3 + 2015 x 6 + 2015
b) 1200 : 75 - 3600 : 225 + 6789
\(a,2015\times3+2015\times6+2015\)
\(=2015\times\left(3+6+1\right)\)
\(=2015\times10=20150\)
\(\left(1200:75\right)-3600:225+6789\)
\(=16-\left(3600:225\right)+6789\)
\(=16-16+6789=6789\)
a) 2015 x 3 + 2015 x 6 + 2015 = 6789
b) 1200 : 75 - 3600 : 225 + 6789 = 20150
Hk tốt..........................
1 Tính nhanh
2015 - ( 403.5 - 2016) - 2016 + 2^2017 : 2^2015 - 2^2015:4^1007-1-3+4-5-6+11
=2015-(2015-2016)-2016+22017-2015-22015/22014-(1-4)-3-(5+6)+11
=(2015-2015)+(2016-2016)+22-2+3-3-11+11
=0+0+(4-2)+(3-3)-(11-11)
=2