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1:
Chiều rộng là 1,6*3/4=1,2m
Chiều dài là 1,2*1,5=1,8m
V=1,2*1,8*1,6=3,456m3
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`1a)-17/30-11/(-15)+(-14)/24`
`=-17/30+22/30+(-7)/12`
`=5/30+(-7)/12`
`=1/6-7/12=2/12-7/12=-5/12`
`1b)(-10)/11*4/7+(-10)/11*3/7+1 10/11`
`=(-10)/11*(4/7+3/7)+1+10/11`
`=-10/11+10/11+1=1`
`1c)(5/7*0,6-5:3 1/2).(40%-1,4).(-2)^3`
`=(5/7*3/5-5:7/2).(0,4-1,4).(-8)`
`=(3/7-10/7).(-1).(-8)`
`=8.(-1)=-8`
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a, 102 . 32 + 53
= 100 . 9 . 125
= 900 . 125
= 112.500
b, 124 : 123 + 73 : 7
= 124-3 + 73-1
= 12 + 72
= 12 + 49
= 61
c, ( 21 + 19 )4 : 402 + 31 - 1600
= 404 : 402 + 31 - 1600
= 402 + 31 - 1600
= 1600 + 31 - 1600
= ( 1600 - 1600 ) + 31
= 0 + 31
= 31
d, ( 572 - 72 )2 + 33 . 2 - 20 000
= 5002 + 27 . 2 - 20 000
= 25 000 + 54 - 20 000
= 25 054 + 20 000
= 5 054
Đây bạn nhé!!!
Học tốt nhé!!!
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a: =6/16-7/16-8/16=-9/16
b: =3/5(4/7+5/7-2/7)=3/5
c: =12+9/16+16+3/25-9-3/25+5+7/16
=26+1=27
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Bài 2 :
a) 45 + 3(x - 4) = 96
3(x - 4) = 96 - 45
3(x - 4) = 51
x - 4 = 51 : 3
x - 4 = 17
b) 22x-2 = 26
\(\Rightarrow\)2x - 2 = 6
2x = 6 + 2
2x = 8
x = 8 : 2
x = 4
Bài 3 :
a) 6413 = (26)13 = 278
Vì 260 < 278\(\Rightarrow\)260 < 6413
b) 2300 = (23)100 = 8100
3200 = (32)100 = 9100
Vì 8 < 9, 100 = 100 \(\Rightarrow\)8100 < 9100 hay 2300 < 3200