Tính nhanh:
a.650 x 32 + 349 x 32 + 32
b. 1273 x 45 - 201 x 45 - 72 x 45
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72 x 11 = 792
32 x 11 = 352
45 x 11 = 495
61 x 11 = 671
53 x 11 = 583
72 * 11 = 792
32 * 11 = 352
45 * 11 = 495
61 *11 = 671
53 *11 = 583
45 x 32 + 45 x 23
= 45 x ( 32 + 23 )
= 45 x 55
= 2475
45 : 32 + 45 : 23
= 1,40625 + 1,9566521739
= 3,362771739
43 x 33 + 43 x 22 + 43
= 43 x ( 33 + 22 + 1 )
= 43 x 56
= 2408
45 x 32 + 45 x 23
= 45 x ( 32 + 23 )
= 45 x 55
= 2475
45 : 32 + 45 : 23
= 1,40625 + 1,9566521739
= 3,362771739
43 x 33 + 43 x 22 + 43
= 43 x ( 33 + 22 + 1 )
= 43 x 56
= 2408
45 . 25 . 32 . 1,25
= 45 . 25 . (32 . 1,25)
= 45 . 25 . 40
= 45 . (25 . 40)
= 45 . 1000
=45000
45 x 25 x 32 x 1,25 = 45 x 25 x 4 x 8 x 1, 25 = 45 x 100 x 8 x 1,25 = 45 x 8 x 1, 25 x 100 = 45 x 8 x 125 = 45 x 1000 = 45000
Bài 3:
a: Ta có: \(23\left(42-x\right)=23\)
\(\Leftrightarrow42-x=1\)
hay x=41
b: Ta có: 15(x-3)=30
nên x-3=2
hay x=5
Bài 1:
a: 32+89+68=100+89=189
b: 64+112+236=300+112=412
c: \(1350+360+650+40=2000+400=2400\)
a, 4 x 113 x 8 - 32 x 13
= (4 x 8) x 113 - 32 x 13
= 32 x 113 - 32 x 13
= 32 x (113 - 13)
= 32 x 100 = 3200
b , 54 x 227 + 45 x 227 + 227
= 227 x (54+45+1)
= 227 x 100
= 22 700
c, ( 145 x 99 + 145 ) - ( 143 x101 - 143 )
= 145 x (99+1) - 143 x (101 - 1)
= 145 x 100 - 143 x 100
= 100 x (145 - 143)
= 100 x 2
= 200
a) \(4\times113\times8-32\times13\)
\(=4\times8\times113-32\times13\)
\(=32\times113-32\times13\)
\(=32\times\left(113-13\right)\)
\(=32\times100\)
\(=3200\)
b) \(54\times227+45\times227+227\)
\(=227\times\left(54+45+1\right)\)
\(=227\times100\)
\(=22700\)
c) \(\left(145\times99+145\right)-\left(143\times101-143\right)\)
\(=145\times\left(99+1\right)-143\left(101-1\right)\)
\(=145\times100-143\times100\)
\(=14500-14300\)
\(=200\)
(82 - 5.x) : 13 - 4 = 0
(82 - 5.x) : 13 = 0 + 4
(82 - 5.x) : 13 = 4
(82 - 5.x) = 4 . 13
(82 - 5.x) = 52
5.x = 82 - 52
5.x = 30
x = 30 : 5 = 6
(32 . 45) : 2 = (x + 70) : 14 - 40
720 = (x + 70) : 14 - 40
(x + 70) : 14 = 720 + 40
(x + 70) : 14 = 760
(x + 70) = 760 . 14
(x + 70) = 10640
x = 10640 - 70
x = 10570
a. 32 x (650 + 349 + 1 )
= 32 x 1000
= 32 000
b. 45 x ( 1273 - 201 - 72)
= 45 x 1000
= 45 000
a. 650 x 32 + 349 x 32 + 32
= (650 + 349 + 1) x 32
= 1000 x 32
= 32000.
b. 1273 x 45 - 201 x 45 - 72 x 45
= (1273 - 201 - 72) x 45
= 1000 x 45
= 45000.