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25: \(\left(-25\right)+8-3\)
\(=\left(-25\right)+\left(8-3\right)\)
=-25+5
=-20
26: \(\left(-28\right)+2+6\)
\(=\left(-28\right)+\left(2+6\right)\)
=-28+8
=-20
27: \(\left(-1\right)+9+12\)
\(=\left(-1+12\right)+9\)
=11+9
=20
28: \(33+8-40\)
\(=\left(33+8\right)-40\)
=41-40
=1
29: \(\left(-80\right)+20+60\)
\(=\left(-80\right)+\left(20+60\right)\)
=-80+80
=0
30: \(\left(-12\right)+3+9\)
\(=\left(-12\right)+\left(3+9\right)\)
=-12+12
=0
25) (-25) + 8 - 3
= (-25 - 3) + 8
= -28 + 8
= -20
26) (-28) + 2 + 6
= -28 + 8
= -20
27) (-1) + 9 + 12
= -1 + (9 + 12)
= -1 + 21
= 20
28) 33 + 8 - 40
= (33 + 8) - 40
= 41 - 40
= 1
29) (-80) + 20 + 60
= -80 + (20 + 60)
= -80 + 80
= 0
30) (-12) + 3 + 9
= -12 + (3 + 9)
= -12 + 12
= 0
1: \(\left(-5\right)+8-7=8+\left(-5-7\right)\)
=-12+8
=-4
2: \(\left(-8\right)+2+8=\left(-8+8\right)+2=0+2=2\)
3: \(\left(-1\right)+3+1\)
\(=\left(-1+1\right)+3\)
=0+3
=3
4: \(\left(-6\right)+8-14\)
\(=\left(-6-14\right)+8\)
=-20+8
=-12
5: \(\left(-4\right)+3-7\)
\(=\left(-4-7\right)+3\)
=-11+3
=-8
6: \(\left(-4\right)+5-2\)
\(=\left(-4-2\right)+5\)
=-6+5
=-1
\(34\times76+66\times110+34\times34\)
\(=34\times\left(76+34\right)+66\times110\)
\(=34\times110+66\times110=110\times\left(34+66\right)=110\times100=110000\)
34 x 76 + 66 x 110 + 34 x 34
= 34 x ( 76 + 34 ) + 66 x 110
= 34 x 110 + 66 x 110
= 110 x ( 34 + 66 )
= 110 x 100
= 11 000
=))
(-12) + (-18)
= -30
------------------
(-90) + 27 + (-10) + 73
= [(-90) + (-10) + (27 + 73)
= -100 + 100
= 0
---------------------------------
25 . (-5) . (-4)
= 25 . (-4) . (-5)
= -100 . (-5)
= 100 . 5
= 500
----------------------------------------
(-15) . 40 : 6
= [(-15) . 40] : 6
= (-600) : 6
= -100
-----------------------------------
(-27) . 58 + (-27) . 42
= (-27) . (58 + 42)
= (-27) . 100
= -2700
\(\frac{-1}{3}:\frac{-5}{6}=\frac{-1}{3}\times\frac{-6}{5}=\frac{2}{5}\)
@muối
Câu 1:
A={1;3;5;7;9}
Câu 2:
A. 24 x 82 + 24 x 18 - 100
= 24 x (82 + 18) - 100
= 24 x 100 - 100
= 2400 - 100 = 2300
B.12 + 3 [ 39 - (5 - 2 )2 ]
= 12 + 3. [39 - 32 ]
= 12 + 3 . [39-9]
= 12 + 3.30
= 12 + 90 = 102
Câu 9
a) 2/15 + (-3/5)
= 2/15 - 3/5
= 2/15 - 9/15
= -7/15
b) -5/7 + 3/7 . (-2/9)
= -5/7 - 2/21
= -15/21 - 2/21
= -17/21
c) 5/16 - (7/15 - 3/16) + 17/30
= 5/16 - 7/15 + 3/16 + 17/30
= (5/16 + 3/16) + (17/30 - 14/30)
= 1/2 + 1/10
= 5/10 + 1/10
= 6/10
= 3/5
\(a,\dfrac{2}{15}+\left(-\dfrac{3}{5}\right)\\ =\dfrac{2}{15}-\dfrac{3}{5}\\ =\dfrac{2}{15}-\dfrac{9}{15}\\ =-\dfrac{7}{15}\\ b,-\dfrac{5}{7}+\dfrac{3}{7}\times\left(-\dfrac{2}{9}\right)\\ =-\dfrac{5}{7}-\dfrac{2}{21}\\ =-\dfrac{15}{21}-\dfrac{2}{21}\\ =-\dfrac{17}{21}\\ c,\dfrac{5}{16}-\left(\dfrac{7}{15}-\dfrac{3}{16}\right)+\dfrac{17}{30}\\ =\dfrac{5}{16}-\dfrac{7}{15}+\dfrac{3}{16}+\dfrac{17}{30}\\ =\left(\dfrac{5}{16}+\dfrac{3}{16}\right)-\left(\dfrac{17}{15}+\dfrac{17}{30}\right)\\ =\dfrac{1}{2}-\dfrac{17}{10}\\ =\dfrac{5}{10}-\dfrac{17}{10}\\ =-\dfrac{6}{5}.\)
g: =4/9(-3/4+27/4)-14/3
=4/9*6-14/3
=8/3-14/3
=-6/3=-2
h: =11/7-3/5-4/9-4/7+8/5-5/9
=8/5
k: =-9/4(2/7-16/7)-2/3
=-9/4*(-2)-2/3
=9/2-2/3
=27/6-4/6
=23/6
m: =9/17*3/11-9/17*12/11-9/17*13/11
=9/17(3/11-12/11-13/11)
=9/17*(-2)=-18/17