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912 + [88 + (-453) + (-547)]
= 912 + [88 - 453 - 547]
= 912 + [88 - (453 + 547)]
= 912 + [88 - 1000]
= 912 + (-912)
= 0
912 + [ 88 + ( - 453) + (-547)]
= 912 + [ - 356 + -547 ]
= 912 + 903
= 1815
k mình nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
Tính nhanh:
912 + [88 + (-453) + (-547)]
= 912 + 88 - 453 - 547
= (912 + 88) - (453 + 547)
= 1000 - 1000
= 0
Thực hiện các phép tính sau:
6-8 = 6 + (-8) = -2
3-(-9) = 3 + 9 = 12
(-5)-10 = (-5) + (-10) = -15
0-7 = -7
4-0 = 4
(-2)-(-10) = (-2) + 10 = 8
Tính:
-2+(-6)+7- 3 = -4
-5-7-3+7 = -8
(-6)-4+5-7+12 = 0
2-(-8)+10-30 = -10
Bỏ dấu ngoặc rồi tính:
a) (4+32+6)+(10-36-6)
= 4 + 32 + 6 + 10 - 36 - 6
= (4 + 32 - 36) + (6 - 6) + 10
= 0 + 0 + 10
= 10
b) (77+22+-65)-(67+12-75)
= 77 + 22 - 65 - 67 - 12 + 75
= (77 - 67) + (22 - 12) - (65 - 75)
= 10 + 10 - (-10)
= 30
c)-(-21+43+7)-(11-53-17).
= 21 - 43 - 7 - 11 + 53 + 17
= (21 - 11) - (43 - 53) - (7 - 17)
= 10 - (-10) - (-10)
= 30
Tham khảo nha!!!
![](https://rs.olm.vn/images/avt/0.png?1311)
46+(88-4.x):4=65
(88-4.x):4=65-46
(88-4.x):4=19
88-4.x=19.4
88-4.x=76
4.x=88-76
4.x=12
x=12:4
x=3
912-(476-16.x):7=69
(476-16.x):7=912-69
(476-16.x):7=843
476-16.x=843.7
476-16.x=5901
16.x=476-5901
16.x=(-5425)
x=(-5425):16
x=(-339,0625)
li-ke cho mình nha mình đang cần li-ke
46 + ( 88 - 4x ) : 4 = 65
( 88 - 4x ) : 4= 65- 46
( 88 - 4x ) = 19
( 88 - 4x ) = 19x 4
88-4x = 76
4x = 88- 76
4x = 8
x = 8 : 4
x = 2
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Giải:
A=1/10+1/40+1/88+1/154+1/238+1/340
A=1/2.5+1/5.8+1/8.11+1/11.14+1/14.17+1/17.20
A=1/2-1/5+1/5-1/8+1/8-1/11+1/11-1/14+1/14-1/17+1/17-1/20
A=1/2-1/20
A=9/20
D=1/3+1/6+1/12+1/24+1/48
D=1/3+1/2.3+1/3.4+1/4.6+1/6.8
D=1/3+1/2-1/3+1/3-1/4+1/2.(2/4.6+2/6.8)
D=1/3+1/2-1/4+1/2.(1/4-1/6+1/6-1/8)
D=1/3+1/4+1/2.(1/4-1/8)
D=1/3+1/4+1/2.1/8
D=1/3+1/4+1/16
D=31/48
F=0,5-1/3-0,4-4/7-1/6+4/35-1/41
F=1/2-1/3-2/5-4/7-1/6+4/35-1/41
F=1/6-(-6/35)-1/6+4/35-1/41
F=(1/6-1/6)+(6/35+4/35)-1/41
F=0+2/7-1/41
F=2/7+1/41
F=75/287
Chúc bạn học tốt!
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(547+389+453+211\)
\(=\left(547+453\right)+\left(389+211\right)\)
\(=1000+600\)
\(=1600\)
b) \(158+445+342+555\)
\(=\left(158+342\right)+\left(445+555\right)\)
\(=500+1000\)
\(=1500\)
c) \(24.3.5.10\)
\(=\left(24.5\right).\left(10.3\right)\)
\(=120.30\)
\(=3600\)
d) \(12.5.15.7\)
\(=\left(12.5\right).\left(15.7\right)\)
\(=60.105\)
\(=6300\)
e) \(1122.34+2244.83\)
\(=1122.2.17+2244.83\)
\(=2244.17+2244.83\)
\(=2244.\left(17+83\right)\)
\(=2244.100\)
\(=224400\)
f) \(8466.15+170.4233\)
\(=8466.15+85.2.4233\)
\(=8466.15+85.8466\)
\(=8466.\left(15+85\right)\)
\(=8466.100\)
\(=846600\)
![](https://rs.olm.vn/images/avt/0.png?1311)
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a.125-(27-75+73)
= 125 - (27 + 73 - 75)
= 125 - (100 - 75)
=125 - 25
=100
b.314-(21-86+79)
= 314 - (21 + 79 - 86)
= 314 - (100 - 86)
= 314 - 14
= 300
c.728-(211-72+89)
= 728 - (211 + 89 -72)
= 728 - (300 - 72)
= 728 - 28
= 700
d.(547-623)-(547-23)
= 547 - 623 - 547 + 23
= 547 - 547 + 23 - 623
= 0 + -600
= - 600
a)125-(27-75+73)=125-27+75-73=(125+75)-(27+73)=200-100=100. b)314-(21-86+79)=314-21+86-79=(314+86)-(21+79)=400-100=300. c) 728-(221-72+89)=(728+72)-(221+89)=800-300=500. d) (547-623)-(547-23)=547-623-547+23=(547-547)+(23-623)=0+(-600)=-600
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[(456 * 11+ 912) * 37 ] : ( 13 * 74 )
= [ ( 5016 + 912 ) * 37 ] : 962
= [ 5928 * 37 ] : 962
= 219 336 : 962
= 228
\(\left[\left(456.11+912\right).37\right]:\left(13.74\right)\)
\(=\left[\left(5016+912\right).37\right]:962\)
\(=\left(5928.37\right):962\)
\(=219336:962\)
\(=228\)
=912+[88+(-1000)
=912+(-912)
=0
k mk nha ^_^