Tính nhanh:58*32+32*8+68*16
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
58 x 42 + 32 x 8 + 5 x 16
= 58 x 42 + 16 x 2 x 8 + 5 x 16
= 58 x 42 + 16 x ( 2 x 8 + 5 )
= 58 x 42 + 16 x 21
= 58 x 2 x21 + 16 x 21
= 21 x ( 58 x 2 + 16 )
= 21 x 132
= 2772
![](https://rs.olm.vn/images/avt/0.png?1311)
58 x 42 + 32 x 8 + 5 x 16
= 58 x 42 + 2 x 16 x 8 + 5 x 16
= 58 x 21 x 2 + 16 x ( 2 x 8 + 5 )
= 58 x 21 x 2 + 16 x 21
= 21 x ( 58 x 2 + 16 )
= 21 x ( 116 + 16 )
= 21 x 132
= 2772
\(58\times42+32\times8+5\times16\)
\(=16\times16+5\times16+58\times42\)
\(=16\times\left(16+5\right)+58\times42\)
\(=16\times21+58\times42\)
\(=16\times21+116\times21\)
\(=\left(16+116\right)\times21\)
\(=132\times21\)\(=2772\)
![](https://rs.olm.vn/images/avt/0.png?1311)
58 x 42 + 32 x 8 + 5 x 16
= 58 x 42 + 2 x 16 x 8 + 5 x 16
= 58 x 21 x 2 + 16 x (2 x 8 + 5)
= 58 x 21 x 2 + 16 x 21
= 21 x (58 x 2 + 16)
= 21 x (116 + 16)
= 21 x 132
= 2772
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
58 x 42 + 32 x 8 + 5 x 16
= 58 x 42 + 16 x 8 x 2 + 5 x 16
= 58 x 42 + 16 x 16 + 5 x 16
= 58 x 42 + (16 + 5) x 16
= 58 x 42 + 21 x 16
= 58 x 2 x 21 + 21 x 16
= 116 x 21 + 21 x 16
= (116 + 16) x 21
= 132 x 21 = 2772
58 x 42+32 x 8+5 x 16
=58 x 42+32 x 8+5 x 2 x 8
=58 x 42+32 x 8+10 x 8
=58 x 42+(32+10) x 8
=58 x 42+42 x 8
=(58+8) x 42
=66 x 41
=2706
![](https://rs.olm.vn/images/avt/0.png?1311)
58 x 42 + 32 x 8 + 5 x16
= (2x29)(21x2) +(4x8)x8 + 5x(4x4)
= 4 x 609 + 4 x 64 + 4x20
= 4( 609+ 64+ 20)
= 4 x 693
= 2772
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
58 x 42 + 32 x 8 + 5 x 16
= 116 x 21 + 16 x 16 + 5 x 16
= 116 x 21 + 16(16 + 5)
= 116 x 21 + 16 x 21
= 21 x ( 116 + 16 )
= 21x 132
= 2772
58*42+32*8+5*16
=58*42+2*16*8+5*16
=58*21*2+16*(2*8+5)
=58*21*2+16*21
=21*(58*2+16)
=21*(116+16)
=21*132
=2772
![](https://rs.olm.vn/images/avt/0.png?1311)
bài 3 : tính nhanh
a) (42*43+43*57+43)-360:4
ngoặc vuông43.(42+57+1) ngoặc vuông -90
43.100-90
4300-90
4210
b.
a) (42*43 + 43*57 + 43) - 360:4
= 43*(42+57+1) - 90
= 43*100 - 90
= 4300 - 90
= 3410
`58xx32+32xx8+68xx16`
`=58xx32+32xx8+32xx34`
`=32xx(58+8+34)`
`=32xx100=3200`
58 x 32 + 32 x 8 + 68 x 16
= 58 x 32 + 32 x 8 + 34 x 2 x 16
= 58 x 32 + 32 x 8 + 34 x 32
= 32 x ( 58 + 8 + 34)
= 32 x 100
= 3200