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C1: 45 - 9 . ( 13 + 5 )
= 45 - 9 . 18
= 45 - 162
= -117
C2: 45 - 9 . ( 13 + 5 )
= 45 - 9 . 13 - 9 . 5
= 45 - 117 - 45
= -117
Cách 1: 45 – 9 . (13 + 5) = 45 – 9 . 18 = 45 – 162 = –117.
Cách 2: 45 – 9 . (13 + 5)
= 9 . 5 – (9 . 13 + 9 . 5)
= 9 . 5 – 9 . 13 - 9 . 5
= (9 . 5 - 9 . 5) – 9 . 13
= –9 . 13 = –117.
a. C1: 15 . 12 - 3.5.10
= 15 . 12 - 15 . 10
= 15.(12 - 10)
= 15 . 2
= 30
C2: 15.12 - 3.5.10
= 15.2.6 - 3.5.2.5
= 30.6 - 30.5
= 30.(6 - 5)
= 30.1
= 30
b. C1: 45 - 9.(13 + 5)
= 45 - 9.13 - 9.5
= 45 - 117 - 45
= -117
C2: 45 - 9.(13 + 5)
= 45 - 9.18
= 45 - 162
= -117
c. C1: 29.(19 - 13) - 19.(29 - 13)
= 29.19 - 29.13 - 19.29 + 19.13
= (29.19 - 19.29) + 19.13 - 29.13
= 0 + 13.(19 - 29)
= 13.(-10)
= -130
C2: 29.(19 - 13) - 19.(29 - 13)
= 29.6 - 19.16
= 174 - 304
= -130
a)cách 1:
15.12-3.5.10
=180-15.10
=180-150
=30
cách 2:
15.12-3.5.10
=15.12-15.10
=15.(12-10)
=15.2
=30
b)45-9.(13+5)
=45-9.18
=45-162
=-117
45-9.(13+5)
=45-9.13+9.5
=45-9.13+45
=(45-45)-9.13
=0-117
=-117
c)29.(19-13)-19.(29-13)
=29.19-29.13-19.29-19.13
=(29.19-19.29)+(19.13-29.13)
=0+13.(19-29)
=0+13.(-10)
=-130
29.(19-13)-19.(29-13)
=29.6-19.16
=174-304
=-130
tick nha bn mk bị âm điểm
`@` `\text {Ans}`
`\downarrow`
`a.`
`A=(1/2-7/13-1/3)+(-6/13+1/2+1 1/3)`
`= 1/2 - 7/13 - 1/3 - 6/13 + 1/2 + 1 1/3`
`= (1/2 + 1/2) + (-7/13 - 6/13) + (-1/3 + 1 1/3) `
`= 1 - 1 + 1`
`= 1`
`b.`
`B=0,75+2/5+(1/9-1 1/2+5/4)`
`= 3/4 + 2/5 + 1/9 - 3/2 + 5/4`
`= (3/4+5/4)+ 1/9 + 2/5 - 3/2`
`= 2 + 1/9 - 11/10`
`= 19/9 - 11/10`
`= 91/90`
`c.`
`(-5/9).3/11+(-13/18).3/11`
`= 3/11*[(-5/9) + (-13/18)]`
`= 3/11*(-23/18)`
`= -23/66`
`d.`
`(-2/3).3/11+(-16/9).3/11`
`= 3/11* [(-2/3) + (-16/9)]`
`= 3/11*(-22/9)`
`= -2/3`
`e.`
`(-1/4).(-2/13)-7/24.(-2/13)`
`= (-2/13)*(-1/4-7/24)`
`= (-2/13)*(-13/24)`
`= 1/12`
`f.`
`(-1/27).3/7+(5/9).(-3/7)`
`= 3/7*(-1/27 - 5/9)`
`= 3/7*(-16/27)`
`= -16/63`
`g.`
`(-1/5+3/7):2/11+(-4/5+4/7):2/11`
`=[(-1/5+3/7)+(-4/5+4/7)] \div 2/11`
`= (-1/5+3/7 - 4/5 + 4/7) \div 2/11`
`= [(-1/5-4/5)+(3/7+4/7)] \div 2/11`
`= (-1+1) \div 2/11`
`= 0 \div 2/11 = 0`
4:
a: =4/15-2,9+11/15=1-2,9=-1,9
b: \(=-36,75+3,7-63,25+6,3=10-100=-90\)
c: \(=6,5+3,5-\dfrac{10}{17}-\dfrac{7}{17}=10-1=9\)
d: \(=\dfrac{13}{25}\left(-39,1-60,9\right)=\dfrac{13}{25}\left(-100\right)=-52\)
e: =-5/12-7/12-3,7-6,3=-1-10=-11
f: =2,8(-6/13-7/13)-7,2=-2,8-7,2=-10
a. C1: 15.12 - 3.5.10
= 15.12 - 15.10
= 15. (12 - 10)
= 15. 2
= 30
C2: 15.12 - 3.5.10
= 180 - 150
= 30
b. C1: 45 - 9.(13+5)
= 9.5 - 9.(13+5)
= 9.[5-(13+5)]
= 9.(5-13-5)
= 9.(-13)
= -117
C2: 45 - 9.(13+5)
= 45 - 9.18
= 45 - 162
= -117
c. C1: 29.(19-13) - 19.(29 - 13)
= 29.19 - 29.13 - 19.29 + 19.13
= 19.13 - 29.13
= (19-29).13
= -10.13
= -130
C2: 29.(19-13)-19.(29-13)
= 29.6-19.16
= 174 - 304
= -130
a. Cách 1: 15.12 - 3.5.10 = 15.12 - 15.10
= 15. (12 - 10)
= 15. 2 = 30
Cách 2: 15.12 - 3.5.10
= 180 - 150
= 30
Cách 1
45-9.(13+5)=45-9.18=45-162=-117
Cách 2
45-9.(13+5)=45-{9.13+9.5)=45-(117+45)=45-162=-117
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45-9(13+5)
= 45-9.18
= 45-162
= -117