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5/14=100/280
3/-40=-3/40=-21/280
-13/-140=13/140=26/180
mà -21<26<100
nên 3/-40<-13/-140<5/14
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a,2.53-36:32
=2.125-36:9
=250-4=246
b,13.75+13.25-140
=13.(75+25)-140
=13.100-140
=1300-140
=1160
c,50-[30-(6-2)2]
=50-[30-42]
=50-[30-16]
=50-14=36
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a) \(2^2.3-\left(1^{10}+8\right):3^2\)
\(=4.3-\left(1+8\right):9\)
\(=12-9:9\)
\(=12-1\)
\(=11\)
b) \(115^0+13.75+13.25-140\)
\(=0+13.\left(75+25\right)-140\)
\(=0+13.100-140\)
\(=0+1300-140\)
\(=1300-140\)
\(=1160\)
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Bài 1 :
a ) 13,75 + 13,25 - 300 = 27 - 300 = -273
b ) 5,42 - ( 30 - 33 ) = 29,16 - ( 30 - 27 ) = 29,16 - 3 = 26,16
c ) 62 : 2 + 2,32 = 36 : 2 + 5,29 = 18 + 5,29 = 23,29
Bài 2 : chịu
Bài 3 :
a ) x + 13 = 35
x = 35 - 13 = 22
b,c ) chịu
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13.75 + 23.13 - 120
= 13.(75 + 23) - 120
= 13.98 - 120
= 1274 - 120
= 1154
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1)T=1+5+9+13+...+105
k/c giua 2 so la:4
so so hang cua T la:
(105-1):4+1=27
tong cua T la:
(105+1).27:2=1431
suy ra tong cua T la :1431
2)b.13.75+86.75+75
=75.(13+86+1)
=75.100
=7500
c.69.73-69.71+12
=69.(73-71)+12
=69.2+12
=138+12
=150
co may cau con lai k hieu ^ la cai gi nen mai nhe
giai thich ^ la cai gi roi giai tiep
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a) 1 3 . 2 5 + 1 3 . 4 5 − 1 5 . 1 3 = 1 3 . 2 5 + 4 5 − 1 5 = 1 3 . 5 5 = 1 3 .
b) − 5 9 . 5 8 + 3 9 . − 5 8 + 5 9 = − 5 9 . 5 8 + − 5 9 . 3 8 + -5 9 . − 1 = − 5 9 . 5 8 + 3 8 − 1 = − 5 9 . 8 8 − 1 = − 5 9 .0 = 0.
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\(13\cdot75+25\cdot13-120\)
\(=975+325-120\)
\(=1300-120\)
\(=1180\)
\(190\cdot64+190\cdot36\)
\(=190\left(64+36\right)\)
\(=190\cdot100\)
\(=19000\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 17 + 15 + (-27)
= (17 - 27) + 15
= -10 + 15
= 5
b) 13.75 + 25.13 - 300
= 13.(75 + 26) - 300
= 13.100 - 300
= 1300 - 300
= 1000
c) 80 - (4.5² - 5.2³) + 2021⁰
= 80 - (4.25 - 5.8) + 1
= 80 - (100 - 40) + 1
= 80 - 60 + 1
= 20 + 1
= 21
=13.(75+25)-140
=13.100-140
=1300-140
=1160
ok bn
13.75+13.25-140
=13(75+25)-140
=13.100-140
=1300-140
=1160