Tính nhanh
413
2013
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A=\(413^2-413.26+13^2=413^2-2.413.13+13^2\)
=> A=\(\left(413-13\right)^2=400^2=160000\)
chuc ban hoc tot
\(\left(413-127+42\right)-\left(413+127-48\right)\)
\(=413-127+42-413-127+48\)
\(=\left(413-413\right)-\left(127+127\right)+\left(42+48\right)\)
\(=-254+90=-164\)
( 413 - 127 + 42 ) - ( 413 + 127 - 48 )
= 413 - 127 + 42 - 413 - 127 + 48
= ( 413 - 413 ) + ( 127 - 127 ) + ( 42 - 48 )
= 0 + 0 + ( -6 )
= -6
B = − 4 13 + 3 5 + 1 3 − 9 13 + 2 5 = − 4 13 + − 9 13 + 3 5 + 2 5 + 1 3 = ( − 1 ) + 1 + 1 3 = 0 + 1 3 = 1 3
a) Ta có: \(413^2+213^2-326\cdot213\)
\(=413^2-2\cdot413\cdot213+213^2+106500\)
\(=200^2+106500\)
\(=40000+106500\)
\(=146500\)
\(325.6+6.650+115.6\)
\(=6.\left(325+650+115\right)\)
\(=6.1090\)
\(=6540\)
\(133:7+154:7+413:7\)
\(=\left(133+154+413\right):7\)
\(=700:7\)
\(=100\)
\(325.6+6.560+115.6\)
\(=6.\left(325+560+115\right)\)
\(=6.1000\)
\(=6000\)
\(133:7+154:7+413:7\)
\(=\left(133+154+413\right):7\)
\(=700:7\)
\(=100\)
113 : 14 + 154 : 14 + 413 : 14
=(113+154+413):14
=680:14
=340/7
(898 x 45 + 989 x 55) x (1002 - 12 - 501 + 413)
= [(898 x (45 + 55) x 989] x ( 990 - 914)
= (898 x 100 x 989) x 76
= (89800 x 989) x 76
Đến đó rồi tự tính nha em!
a)
=347x6+347x3+347x1
=347x(6+3+1)
=347x10
=3470
b)
=2013x3+2013x7
=2013x(3+7)
=2013x10
=20130
a)
= 347 x 6 + 347 x 3 + 347 x 1
= 347 x ( 6 + 3 + 1 )
= 347 x 10
=3 470
b)
=2 013 x 3 + 2 013 x 7
=2 013 x ( 3 + 7 )
=2 013 x 10
=20 130
`Thảo`
B = 113 : 7 + 154 : 7 + 413 : 7
B = (113 + 154 + 413) : 7
B = 680 : 7
B = 680/7
413=68921
2013 = 8120601
\(41^3=\left(40+1\right)^3=40^3+3.40^2.1+3.40.1^2+1^3\)
\(=64000+4800+120+1=68921\)
\(\left(201\right)^3=\left(200+1\right)^3=200^3+3.200^2.1+3.200.1^2+1^3\)
\(=8000000+120000+600+1=8120601\)