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214+[120-(214+120)]
=214+120-(214+120)
=214+120-214-120
=(214-214)+(120-120)
=0+0=0
(-321)-[(-321+35)-235]
=(-321)-(-321+35)+235
=(-321)+(-321-35)-235
=-321-(-321) +(235-35)
=0+200
=200
(18+29)+(158-29-18)
=18+29+158-29-18
=(18-18)+(29-29)+158
=0+0+158
=158
(13-135+49)-(13+49)
=13-135+49-13-49
=(13-13)+(49-49)-135
=0-135
= -135
25+(-13+8)
=25+(-5)
=20
7+(-12+43)-[2+(19-34)]
=7+31-[2+(-15)]
=7+31-(-13)
=38+(-13)
=25
nhiều quá, mk phụ chút thôi
1.a)214+[120-(214+120)=214+120-214-120=(214-214)+(120-120)=0+0=0
b)(-321)-[(-321+35)-235]=(-321)+321-35+235=[(-321)+321]+(235-35)=0+200=200
2.a)(18+29)+(158-29-18)=18+29+158-29-18=(18-18)+(29-29)+158=0+0+158=158
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(19\frac{5}{8}:\frac{7}{12}-13\frac{1}{4}:\frac{7}{12}\right).\frac{4}{5}\)
\(=\left(\frac{157}{8}:\frac{7}{12}-\frac{53}{4}:\frac{7}{12}\right).\frac{4}{5}\)
\(=\left[\left(\frac{157}{8}-\frac{53}{4}\right):\frac{7}{12}\right].\frac{4}{5}\)
\(=\left[\frac{51}{8}:\frac{7}{12}\right].\frac{4}{5}\)
\(=\frac{153}{14}.\frac{4}{5}\)
\(=\frac{306}{35}\)
\(\left(\frac{-2}{5}+\frac{3}{7}\right)-\left(\frac{4}{9}+\frac{12}{20}-\frac{13}{35}\right)+\frac{7}{35}\)
\(=\frac{1}{35}-\frac{212}{315}+\frac{7}{35}\)
\(=\frac{1}{35}+\frac{-212}{315}+\frac{7}{35}\)
\(=\frac{9}{315}+\frac{-212}{315}+\frac{63}{315}\)
\(=\frac{-140}{315}=\frac{-4}{9}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 2:
a) 1 + (-4) + 7 + (-10) + 13 + (-35)
= [1 + (-4) + (-10)] + [7 + (-35)] + 13
= -13 + (-28) + 13
= [-13+13] + (-28)
=0 + (-28)
= -28
b) -2 + 7 . (-12) + 17 . (-22) + 27
= -2 + (- 84) + (-374) + 27
= -86 + (-374) + 27
= -460 + 27
= -433
Bài 3 với Bài 4 mình ko có TG để ghi từng dòng nên mình chỉ ghi đáp án thôi nhé
Bài 3:
a)56 + (-29)+ (-7) + 28 +13 + (-16)
=45
b)1316 + 317 + (-14) + 217 + 54 (-49)
=810
Bài 4:
a)435 + (-43) + (-483) + 383 + (-415)
=-123
b)1316 + 317 + (-1216) + (-315) +(-85)
=17
#Học tốt
&YOUTUBER&
![](https://rs.olm.vn/images/avt/0.png?1311)
1) = 35 . 18 - 35 . 18 = 0
2) = 45 - 5 . 12 + 5 . 9 = 45 - 60 + 45 = 30
3) = 24 . 16 - 24 . 5 - 16 . 24 - 16 . 5
= (24 . 16 - 16 . 24) - 5 (24 - 16)
= 0 - 5 . 8 = 0 - 40 = -40
4) = 29 . 19 - 29 . 13 - 19 . 29 - 19 . 13
= (29 . 19 - 29 . 19) - 13 (29 - 19)
= 0 - 13 . 10 = 0 - 130 = -130
5) = 31 . (-18) + 31 . (-81) - 31 . 1
= 31 [(-18) + (-81) - 1]
= 31 . (-100) = -3100
6) = (-12) . 47 + (-12) . 52 + (-12). 1
= (-12) . (47 + 52 + 1)
= (-12) . 100 = -1200
7) = 13 . 45 - 3 . 45
= 45 (13 - 3)
= 45 . 10 = 450
8) = (-48) + 48 . (-78) + 48 . (-21)
= (-48) . 1 + 48 . (-78) + 48 . (-21)
= 48 . (-1) + 48 . (-78) + 48 . (-21)
= 48 . [(-1) + (-78) + (-21)]
= 48 . (-100) = -4800
1) 35x18-5x7x18
= 35x18-35x18
= 35x(18-18)
= 35x0=0
3) 24.(16-5)-16.(24-5)
= 24.16-24.5-16.24-16.5
=[24.16-16.24]-[24.5-16.5]
= [ 24. (16-16)]- [(24-16).5]
= [24.0]-[8.5]
= 0-40=-40
4) 29.(19-13)-19.(29-13)
=29.19-29.13-19.29-19.13
=[ 29.19-19.29]-[ 29.13-19.13]
= [ 29.(19-19)]-[(29-19).13]
=[29.0]-[10.13]
= 0-130= -130
5) 31.(-18)+31.(-81)-31
= 31.(-18)+31.(-81)-31.1
= 31.[(-18)+(-81)-1]
=31.(-100)
= -3100
6);7);8 tương tự 4);5);6)
\(56+\left(-29\right)+\left(-7\right)+28+13+\left(-35\right)\)
\(=\)\(27+\left(-7\right)+28+13+\left(-35\right)\)
\(=\)\(20+28+13+\left(-35\right)\)
\(=\)\(48+13+\left(-35\right)\)
\(=\)\(61+\left(-35\right)\)
\(=\)\(26\)