Tính nhanh:
\(\frac{124.237+152}{870+235.122}\)
Tính nhanh (124.237+152):(870+235.122)
TÍnh nhanh
( 124.237 +152) :(870+235.122)
Bài 1: Tính nhanh:
[124.237+152] :[870+235.122]
tính nhanh
(124.237+152):(870+235.122)
(124.237+152):(870+235.122)
= 29540 : 29540
= 1
(124.237+152):(870+235.122)
= ( 29388 + 152 ) : ( 870 + 28670 )
= 29540 : 29540
= 1
bài 5 tính nhanh
a, 1990 .1990 - 1992 . 1988
b, ( 1374 . 57 + 687 .86) : ( 870+235.122)
c, ( 124.237 +152 ) : ( 870+235.122)
d, 423134 . 846267 - 423133/ 846267 . 423133 + 423134
#Toán lớp 6a) 1990.1990 - 1992.1988
= 1990.1990 - (1990 + 2)(1990 - 2)
= 1990.1990 - 1990.1990 + 4 = 4
b) (1374.57 + 687.86) : (870 + 235.122)
= (1374.57 + 687.2.43) : (10.87 + 5.47.2.61)
= (1374.57 + 1374.43) : (10.87 + 10.47.61)
= [1374(57 + 43)] : [10(87 + 47.61)]
= (1374.100) : [10(87 + 47.61)] (đoạn này mẫu số xấu quá, hetcuu)
c) (124.237 + 152) : (870 + 235.122)
= (124.235 + 124.2 + 152) : (870 + 235.122)
= (122.235 + 2.235 + 2.124 + 152) : (870 + 235.122)
= (122.235 + 470 + 248 + 152) : (235.122 + 870)
= (122.235 + 870) : (235.122 + 870) = 1
d) \(\dfrac{423134\cdot846267-423133}{846267\cdot423133+423134}=\dfrac{423133\cdot846267+846267-423133}{846267\cdot423133+423134}\)
\(=\dfrac{423133\cdot846267+423134}{846267\cdot423133+423134}=1\)
Tính nhanh:
(124.237+152):(870+235.122)
\(\frac{423124.846267-423133}{846267.423133+423134}\)
tính giá trị biểu thức(tính nhanh nếu có thể)
A=20092009.2008-20082008.2009
B=(124.237+152):(870+235.122)
A=20092009.2008-20082008.2009
=20092009:10001.2008-20082008:10001.2009
=2009.2008-2008.2009
=(2009-2009).(2008-2008)
=0.0=0
A = 20092009 . 2008 - 20082008.2009
= 2009.10001 . 2008 - 2008.10001 . 2009
= 0
B = 1
\(\frac{124.237+152}{870+235.122}\)
lắm rùi mà ?Announced the Upa and Polar
(124.237+152):(870+235.122)
= 1
124.237 + 152 = 122. 237 + 2.237 + 152 = 122.235 + 2.122 + 474 + 152 = 122 .235 + 244 + 474 + 152 = 122 .235 870 : 870 + 235 .122 = 1
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