Tính nhanh :
37.75+37.45-25.74-35.14
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a) 37.75+37.45+63.67+63.53
= 37.(75+45)+63.(67+53)
= 37.120+63.120
= 120.(37+63)
= 120.100
= 12000
b) 35.34+35.86+65.75+65.45
= 35.(34+86)+65.(75+45)
= 35.120+65.120
=120.(35+65)
= 120.100
= 12000
c) 78.31+78.24+78.17+22.72
= 78.(31+24+17)+22.72
= 78.72+22.72
= 72.(78+22)
= 72.100
= 7200
a) 37 .75+37 .45+63 .67+63 .5337 .75+37 .45+63 .67+63 .53
=37 .(75+45)+63 .(67+53)=37 .(75+45)+63 .(67+53)
=37 .120+63 .120=37 .120+63 .120
=(37+63) .120=(37+63) .120
=100 .120=100 .120
=12000
b) 35⋅34+35⋅86+65⋅75+65⋅45=35(34+86)+65(75+45)=35⋅120+65⋅120=(35+65)⋅120=100⋅120=12000
c) 78 . 31 + 78 . 24 + 78 . 17 + 22 . 72
= 78 . ( 31 + 24 + 17 ) + 22 . 72
= 78 . 72 + 22 . 72
= 72 . ( 78 + 22 )
= 72 .100
= 7200
chúc bạn học tốt ❤❤❤
a) 37.75+37.45+63.67+63.53
= 37.(75 + 45) + 63.(67 + 53)
= 37 . 120 + 63 . 120
= 120 . (37 + 63)
= 120 . 100
= 12 000
`@` `\text {Ans}`
`\downarrow`
\(5\cdot19+5\cdot81\cdot10\)
`=`\(5\cdot\left(19+81\cdot10\right)\)
`=`\(5\cdot\left(19+810\right)\)
`=`\(5\cdot829\)
`= 4145`
____
\(37\cdot54+37\cdot45+37\)
`=`\(37\cdot\left(54+45+1\right)\)
`=`\(37\cdot100\)
`= 3700`
____
`7*32 + 14*34`
`= 7*2*16 + 7*2*34`
`= (7*2)*(16+34)`
`= 14*50`
`= 700`
5.19+5.81.10
=5.(19+81).10
=5.100.10
=500.10
=5000
xong:)
\(76-\left\{2\cdot\left[2\cdot5^2-\left(31-2\cdot3\right)\right]\right\}\)
\(=76-\left\{2\cdot\left[2\cdot25-\left(31-6\right)\right]\right\}\)
\(=75-\left[2\cdot\left(50-25\right)\right]\)
\(=76-\left(2\cdot25\right)\)
\(=76-50\)
\(=26\)
____________________
\(6^2\cdot10:\left\{780:\left[10^3-\left(2\cdot5^3+35\cdot14\right)\right]\right\}\)
\(=36\cdot10:\left\{780:\left[1000-\left(2\cdot125+490\right)\right]\right\}\)
\(=360:\left\{780:\left[1000-\left(250+490\right)\right]\right\}\)
\(=360:\left[780:\left(1000-740\right)\right]\)
\(=360:\left(780:260\right)\)
\(=360:3\)
\(=120\)
a: =76-{2*[2*25-31+6]}
=76-{2*[50-31+6]}
=76-2*25
=76-50=26
b: \(=360:\left\{\dfrac{780}{1000-2\cdot125-490}\right\}\)
\(=360:\dfrac{780}{260}\)
=360/3=120
\(37.75+56.75-93.65\)
\(=75.\left(37+56\right)-93.65\)
\(=75.93-93.65\)
\(=93.\left(75-65\right)\)
\(=93.10\)
\(=930\)
62.87+35.14+4.13+8.35+4.35+5.65
=35.(4+5+14)+62.87+5.65+4.13
=35.23+62.87+5.65+4.13
=6576
62 . 10 : { 780 : [ 103 - ( 2 . 53 + 35 . 14 ) ] }
= 360 : { 780 : [ 1000 - ( 250 + 490 ) ] }
= 360 : { 780 : [ 1000 - 740 ] }
= 360 : { 780 : 260 }
= 360 : 3
= 120.
\(a,\left\{\left[\left(37+13\right):5\right]-45:5\right\}.7\)
\(=\left\{\left[50:5\right]-45:5\right\}.7\)
\(=\left\{10-45:5\right\}.7\)
\(=\left\{10-9\right\}.7\)
\(=1.7=7\)
=37.75+37.45-25.2.37-35.14
=37.(75+45+50)-35.14
=37.70-35.14
=37.2.35-35.14
=74.35-35.14
=35.(74-14)
=35.60
=2100
37.75+37.45-25.74-35.14=2100