39x(64-21)+21x(39+64) tinh nhanh
Tinh bang cách hợp lý nhất
A,39×8+60×2+21×8 b,12×53+53×172-53×84
C,35×34+35×86+65×75+65×67+65×45
D,36×28+36×82+64×69+64×41
a, 39 . 8 + 60 . 2 + 21 . 8
= 39 . 8 + 15 . 4 . 2 + 21 . 8
= 39 . 8 + 15 . 8 + 21 . 8
= 8 . ( 39 + 15 + 21 )
= 8 . 75
= 600
b, 12 . 53 + 53 . 172 - 53 . 84
= 53 . ( 12 + 172 - 84 )
= 53 . 100
= 5300
c, 35 . 34 + 35 . 86 + 65 . 75 + 65. 67 + 65.45
= 35 . ( 34 + 86 ) + 65 . ( 75 + 67 + 45 )
= 35 . 120 + 65 . 187
= 4200 + 12155
= 16355
d, 36 . 28 + 36 . 82 + 64 . 69 + 64 . 41
= 36 . ( 28 + 82 ) + 64 . ( 69 + 41 )
= 36 . 110 + 64 . 110
= 110 . ( 36 + 64 )
= 110 . 100
= 11000
a, 39 . 8 + 60 . 2 + 21 . 8
= 39 . 8 + 15 . 4 . 2 + 21 . 8
= 39 . 8 + 15 . 8 + 21 . 8
= 8 . ( 39 + 15 + 21 )
= 8 . 75
= 600
b, 12 . 53 + 53 . 172 - 53 . 84
= 53 . ( 12 + 172 - 84 )
= 53 . 100
= 5300
c, 35 . 34 + 35 . 86 + 65 . 75 + 65. 67 + 65.45
= 35 . ( 34 + 86 ) + 65 . ( 75 + 67 + 45 )
= 35 . 120 + 65 . 187
= 4200 + 12155
= 16355
d, 36 . 28 + 36 . 82 + 64 . 69 + 64 . 41
= 36 . ( 28 + 82 ) + 64 . ( 69 + 41 )
= 36 . 110 + 64 . 110
= 110 . ( 36 + 64 )
= 110 . 100
= 11000
a) 35 . 34 + 35 . 38 + 65 . 75 + 65 . 45
b) 39 . 8 + 60 . 2 + 21 . 8
c) 36 . 28 + 36 . 82 + 64 . 69 + 64 . 4
d) 123 . 1001
<<TÍNH NHANH GIÚP MÌNH NHA !!! >>
Bài làm :
\(a,35.34+35.38+65.75+65.45\)
\(=35.\left(34+38\right)+65.\left(74+45\right)\)
\(=35.72+65.120\)
\(=2520+780\)
\(=10320\)
\(b,39.8+60.2+21.8\)
\(=\left(39+21\right).8+60.2\)
\(=60.8+60.2\)
\(=60.\left(8+2\right)\)
\(=60.10=600\)
\(c,36.28+36.82+64.69+64.4\)
\(=36.\left(28+82\right)+64.\left(69+4\right)\)
\(=36.110+64.73\)
\(=3960+4672\)
\(=8632\)
\(d,123.1001\)
\(=123123\)
Học tốt
tinh nhanh
36*28+36*82+64*69+64*41
chia làm 2 phần:
36x28+36x82
+
64x69+69x41
=
36 x (28+82)
+
69 x (64+41)
=
36 x 110
+
69 x 105
=
(36 x 100) + (36 x 10)
+
(69 x 100) + (69 x 5)
=
3600 + 360
+
6900 + 345
=
3960
+
7245
đáp số:
11205
\(36.28+36.82+64.69+64.41\)
\(=36\left(28+82\right)+64\left(69+41\right)\)
\(=36.110+64.110\)
\(=110\left(36+64\right)\)
\(=110.100=11000\)
1 a, 21 : 0,125 : 800
b, 2037 : 50 : 200
c, 128 - 28 ; 14
37 x 51 + 24 x 37 + 37 +76 x 64
tinh nhanh nha
Tính nhanh :
9 x 4 x 101 + 108 x 21 – 64 x 36
9 × 4 × 101 + 108 × 21 - 64 × 36
= 36 × 101 + 36 × 3 × 21 - 64 × 36
= 36 × (101 + 3 × 21 - 64)
= 36 × (101 + 63 - 64)
= 36 × 100
= 3600
tinh nhanh 35 + 64 + 65 + 36 =?
35 + 64 + 65 + 36
= ( 35 + 65 ) + ( ( 64 + 36 )
= 100 + 100
= 200
35+64+65+36=(35+65)+(36+64)
=100+100
=200
: Tinh nhanh
. 64*25+35*25+25
64 x 25 +35 x 25 +25
=(64+35+1) x 25
=100 x 25
=2500
64 x 25 + 35 x 25 + 25
= ( 64 + 35 + 1 ) x 25
= 100 x 25
= 2500
tinh nhanh A= 2010.(2011-64)+1005.(328-2.2011)
nham roi toi la con gai ,voi la ba dau tra loi ma toi tick lai
tinh nhanh
29+64+71+36=?
29 + 64 + 71 + 36
= ( 29 + 71 ) + ( 64 + 36 )
= 100 + 100
= 100 x 2
= 200
29 + 64 + 71 + 36
= ( 29 + 71 ) + ( 64 + 36 )
= 100 + 100
= 100 x 2
= 200