tính nhanh:
a.25x50x4x2
b.145x36-36x46+36
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đặt 6/16.26+6.2006.2016=A
ta có:
A=6/16.26+6/26.36+...+6/2006.2016
A=6.(1/16.26+1/26.36+...+1/2006.2016)
A=6(10/16.26+...+10/2006.2016)
A=6(1/16-1/26+1/26-1/36+...+1/2006-1/2016)
A=6(1/17-1/2016)
A=6.1999/34272
A=1999/5712
ta có:
1/16+6/16.26+...+6/2006.2016=1/16+1999/5712=..........
mk nghĩ làm thế này mà ko biết đúng hay sai
đặt A=1/16 + 6/16x26+ 6/26x36 +6/36x46 +......+6/2006x2016
\(\Leftrightarrow A=\frac{1}{16}+\frac{6}{16}-\frac{6}{26}+...+\frac{6}{2006}-\frac{6}{2016}\)
\(\Rightarrow A=\frac{1}{16}+\frac{1}{16}-\frac{1}{26}+...+\frac{1}{2006}-\frac{1}{2016}\)
\(\Rightarrow A=-\frac{1}{2016}\)
hình như là thế
a) \(\left(7200+36\right):36\)
\(=7200:36+36:36\)
\(=36\cdot200:36+1\)
\(=201\)
b) \(\left(3600-84\right):12\)
\(=12\cdot300:12-84:12\)
\(=293\)
a)63x113+36x113+113
=113x(36+63+1)
=113x100
=11300
b)115x(36+62)-15x(62+36)
=115x98-15x98
=11270-1470
=9800
a,63.113+36.113+113
=63.113+36.113+113.1
=(63+36+1).113
=100.113
=11300
b,115.(36+62)-15.(62+36)
=115.98-15.98
=(115-15).98
=100.98
=9800
a 36x 6+ 36x4
=36x[6+4]
=36x10
=360
b 1368 x99+1368
=1368 x[99+1]
=1368x100
=136800
a) 36x6+36x4=36x(6+4)=36x10=360
b) 1368x99+1368=1368x(99+1)=1368x100=136800
A,(36×28+36×28)÷73
=36x(28+28):73
=36x56:73
=2016:73
=2016/73
B,(98×17-26×17)÷72
=17x(98-26):72
=17x72:72
=17x(72:72)
=17x1
=17
\(\left(-75\right)\left(18-65\right)-65\left(75-18\right)\)
\(=\left(-75\right).18-\left(-75\right).65-65.75+65.18\)
\(=\left(-75\right).18+75.65-65.75+65.18\)
\(=18.\left[\left(-75\right)+65\right]+\left(75.65-65.75\right)\)
\(=18.\left(-10\right)=-180\)
P/s: Hoq chắc
a) 36 + 53 + 47 + 64 = (36+64)+(53+47)= 100+100=200
b) =(242-42)+(167-67)= 200+100=300
a) − 6 13 − 1 − − 7 13 = − 6 13 − 1 + − 7 13 = − 6 13 + − 7 13 − 1 = − 1 − 1 = − 2
b) 1 9 + − 5 17 + 3 6 + − 12 17 + − 1 2 + 5 9 = 1 9 + − 5 17 + 3 6 + − 12 17 + − 1 2 + 5 9 = − 5 17 + − 12 17 + 1 9 + 5 9 + 3 6 + − 1 2 = − 1 + 2 3 + 0 = − 1 3
a) ( 36 x 28 + 36 x 45 ) : 73
= 36 x (28 + 45 ):73
=36 x 73 :73
= 36 x (73 : 73)
= 36 x 1
= 36
b) ( 98 x 17 - 26 x 17 ) : 72
= 17 x (98-17):72
= 17 x 72 :72
=17 x (72 :72)
= 17 x 1
= 17
a) ( 36 x 28 + 36 x 45 ) : 73 = 36
b) ( 98 x 17 - 26 x 17 ) : 72 = 17
a; 25 x 50 x 4 x 2
= (25 x 4) x ( 50 x 2)
= 100 x 100
= 10 00
b: \(145\cdot36-36\cdot46+36\)
\(=36\left(145-46+1\right)\)
\(=36\cdot100=3600\)