28 x 17+101 x 3 + 73 x 17 Tính 1 cách nhanh nhất
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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
![](https://rs.olm.vn/images/avt/0.png?1311)
a =143
b = 2510
c 28 x 73 = 2044
cái câu c tính nhẩm chết liền
d [ 1700 - 340 +17 ] : 17 = 81
2 . Tìm x
a 7 . [ x - 3 ] - 6 = 1
7 . [ x - 3 ] = 1+6
7 . [ x - 3 ] = 7
x - 3 = 7 : 7
x - 3 =1
x=3+1=4
b
[x+5] .2:11=6
[x+5] x 2 = 6 x 11
[ x + 5 ] x 2 = 66
x+2=66:2
x+2=33
x=33-2=31
Bài 1
a, \(45+98=143\)
b, \(2605-95=2510\)
c,\(28.73+28\)
\(=28.\left(73+1\right)\)
\(=28.74\)
\(=2072\)
d,\(\left[1700-340+17\right]:17\)
\(=1700:17-340:17+17:17\)
\(=100-20+1\)
\(=81\)
Bài 2
a, \(7.\left(x-3\right)-6=1\)
\(\Leftrightarrow7.\left(x-3\right)=7\)
\(\Leftrightarrow x-3=1\)
\(\Leftrightarrow x=4\)
b, \(\left(x+2\right).2:11=6\)
\(\Leftrightarrow\left(x+2\right).2=66\)
\(\Leftrightarrow x+2=33\)
\(\Leftrightarrow x=31\)
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a ) 17 x 4 = ( 15 + 2 ) x 4 = 15 x 4 + 2 x 4 = 60 + 8 = 68
25 x 28 = 25 x ( 20 + 8 ) = 25 x 20 + 25 x 8 = 500 + 200 = 700
b ) 13 x 12 = 13 x ( 10 + 2 ) = 13 x 10 + 13 x 2 = 130 + 26 = 156
53 x 11 = 53 x ( 10 + 1 ) = 53 x 10 + 53 x 1 = 530 + 53 = 583
39 x 101 = 39 x ( 100 + 1 ) = 39 x 100 + 39 x 1 = 3900 + 39 = 3939
a) Ta có:
\(17\times4=\left(15+2\right)\times4=15\times4+2\times4=60+8=68\)
\(25\times28=25\times\left(20+8\right)=25\times20+25\times8=500+200=700\)
b) Ta có:
\(13\times12=13\times\left(10+2\right)=13\times10+13\times2=130+26=156\)
\(53\times11=53\times\left(10+1\right)=53\times10+53\times1=530+53=583\)
\(39\times101=39\times\left(100+1\right)=39\times100+39\times1=3900+39=3939\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
(137x99+137)-(17x101-17) = 137x(99+1)-17x(101-1) = 137x100-17x100 = 100x(137-17) = 100x120 = 12000
![](https://rs.olm.vn/images/avt/0.png?1311)
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
![](https://rs.olm.vn/images/avt/0.png?1311)
a)=>56.(27+32):62
=>56.62:62
=>56.1
=56
b)tự làm
c)=>45.(16+15)-17/28
=>45.31-17/28
=>1395-17/28
=19513/14
d)=>27.(45+55)/(18+2).9:2
=>2700/90
=30
![](https://rs.olm.vn/images/avt/0.png?1311)
28 x 17 + 101 x 3 + 73 x 17 = 17 x (28 + 73) + 101 x 3
= 17 x 101 + 101 x 3
= 101 x (17 + 3)
= 101 x 20
= 2020
28 x 17 + 101x 3 + 73 x 17
= 17x ( 28 + 73 ) + 101 x 3
= 101 x 17 + 101x 3
= 101x( 17 + 3)
= 101 x 20
= 2020