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34.{[(216+184):8]-42}
=34.{[400:8]-42}
=34.{50-42}
=34.8
=272
465+58+(-465)+(-78)
=523+(-465)+(-78)
=58+(-78)
=-20
1+(-3)+5+(-7)+9+(-11)
=[1+(-3)]+[5+(-7)]+[9+(-11)]
=-2.3
=-6
1+2+3.......+100
=101x50
=5050
80-[30-(5-1)2]
=80-[30-4.2]
=80-[30-8]
=80-22
=58
34.{[(216+184):8]-42}
= 34.[(400:8)-42]
= 34.(50-42)
= 34.8
= 272
465+58+(-465)+(-78)
= (465-465)+(58-78)
= 0+(-20)
= -20
1+(-3)+5+(-7)+9+(-11)
= (1+5+9)-(3+7+11)
= 15-21
= -6
1+2+3+...+100=\(\frac{\left(100+1\right).100}{2}\)=5050
80-[30-(5-1).2]
= 80-(30-4.2)
= 80-(30-8)
= 80-30+8
= 50+8
= 58
1-2-3+4+5-6-7+8+9-10-11+......................-78+80
\(=\left(1-2-3\right)+4+\left(5-6-7\right)+8+...+\left(77-78-79\right)+80\)\(=\left(-4\right)+4+\left(-8\right)+8+...+\left(-80\right)+80\)\(=0+0+...+0=0\)
1) 5 + (-4) = 1
2) (-8) + 2 = -6
3) 8 + (-2) = 6
4) 11 + (-3) = 8
5) (-11) + 2 = -9
6) (-7) + 3 = -4
7) (-5) + 5 = 0
8) 11 + (-12) = -1
9) (-18) + 20 = 2
10) (15) + (-12) = 3
11) (-17) + 17 = 0
12) 16 + (-2) = 14
13) (30) + (-14) = 16
14) (-19) + 20 = 1
15) (-18) + 15 = -3
16) (10) + (-6) = 4
17) (-28) + 14 = -14
18) 15 + (-30) = -15
19) (15) + (-4) = 11
20) (-21) + 11 = -10
21) 8 + (-22) = -14
22) (-15) + 4 = -11
23) (-3) + 2 = -1
24) 17 + (-14) = 3
25) 17 + (-14) = 3
a,5/9+(-3/5) +( -5/9)
=5/9+(-5/9)+(-3/5)
=0+(-3/5)
=-3/5
b, b,-3/7. 2/11- (-3/7).9/11
=-3/7.(2/11-9/11)
=-3/7.(-7/11)
=3/11
c,,2/3 + 5/6 : 5 - 1/18 . (-3)
=2/3+(1/6-(-1/6))
=2/3+1/3
=3/3
=1
tick nếu đúng nha
1: \(78+22+18\)
\(=\left(78+22\right)+18\)
=100+18
=118
2: \(94+563+\left(106-563\right)-\left(-70\right)\)
\(=94+563+106-563+70\)
\(=\left(94+106\right)-\left(563-563\right)+70\)
=100-0+70
=170
3: \(25\cdot154-25+47\cdot25\)
\(=25\left(154-1+47\right)\)
\(=25\cdot200=5000\)
4: \(\left[5^{29}+5^{30}\left(16-11\right)\right]:5^{29}\)
\(=\left(5^{29}+5^{30}\cdot5\right):5^{29}\)
\(=\dfrac{5^{29}\cdot1+5^{29}\cdot5^2}{5^{29}}\)
\(=1+5^2=26\)
8: \(25\cdot2^3-\left(9-14\right)+\left(29-34+20\right)\)
\(=25\cdot8-\left(-5\right)+\left(-5\right)+20\)
\(=200+5-5+20\)
=220
a: =5/6(-12/7)-1/2=-10/7-1/2=-27/14
b: =11/9(-6/5+1/5)=-11/9
465+58+(-465)+(-78)=-20
1+(-3)+5+(-7)+9+(-11)=-6
465+58+(-465)+(-78)=(-78)-(-58)=-20
1+(-3)+5+(-7)+9(-11)=-2+-2+-2=-6
1+2+3+...+100=(100+1)*(100-1)+1:2=101*100:2
101*50=5050
**** mk nha Thanh Trúc thông minh