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1: Ta có: \(2155-\left(174+2155\right)+\left(-68+174\right)\)
\(=2155-174-2155-68+174\)
=-68
2) Ta có: \(-25\cdot72+25\cdot21-49\cdot25\)
\(=-25\cdot\left(72-21+49\right)\)
\(=-25\cdot100=-2500\)
; b) 
;
; d) 
;
Bài 1:
a) Ta có: 49+(11-25)
=49+11-25
=24+11
=35
b) Ta có: \(-8+5\cdot\left(-9\right)\)
\(=-8-45\)
=-53
Bài 2:
a) Ta có: \(x-2=-6+17\)
\(\Leftrightarrow x-2=11\)
hay x=13
Vậy: x=13
b) Ta có: \(x+9=2-17\)
\(\Leftrightarrow x+9=-15\)
hay x=-24
Vậy: x=-24
1) 2155-(174+2155)+(-68+174-7)-1911-(1234-1911)
=2155-174-2155+(-68)+174-7-1911-1234+1911
=(2155-2155)+(174-174)+(1911-1911)-(68+7+1234)
= 0 + 0 + 0 - 1309
= -1309
\(27.332+93.43+57.61+69.57\\ =27.332+93.43+57.\left(61+69\right)\\ =27.332+93.43+57.130\\ =8964+3999+7410=20373\\ 34.75+75.66-65.100\\ =\left(34+66\right).75-65.100\\ =100.75-65.100\\ =100.\left(75-65\right)\\ =100.10=1000\\ \left(456.11+912\right).37:13:74\\ =5928:13:\left(74:37\right)\\ =456:2=228\\ 6^2:4.3+2.5^2\\ =36:4.3+2.25\\ =9.3+50=27+50=77\\ 5.4^2-18:3^2\\ =5.16-18:9\\ =80-2=78\\\left[\left(315+372\right).3+\left(372+315\right).7\right]:\left(26.13+74.14\right)\\ =687.\left(3+7\right):\left(338+1036\right)\\ 687.10:1374\\ =6870:1374=5\\ 12:\left\{390:\left[500-\left(125+35.7\right)\right]\right\}\\ =12:\left[390:\left(500-370\right)\right]\\ =12:\left(390:130\right)=12:3=4\\ 192000-\left(1500.2+1800.3+1800.2:3\right)\\ =192000-\left(3000+5400+1200\right)\\ =192000-9600=182400\)
Bài 1: Thực hiện các phép tính sau:
\(a)\)Chưa rỏ đề
\(b)\)\(5025\div5-25\div5\)
\(=\)\(1005-5\)
\(=\)\(1000\)
\(c)\)\(218-180\div2\div9\)
\(=\)\(218-10\)
\(=\)\(208\)
\(d)\)\(\left(328-8\right)\div32\)
\(=\)\(320\div32\)
\(=\)\(10\)
Bài 1:
a) ( Tôi không nhìn rõ đầu bài )
b) 5025 : 5 - 25 : 5
= ( 5025 - 25 ) : 5
= 5000 : 5
= 1000
c) 218 - 180 : 2 : 9
= 218 - 180 : ( 2 . 9 )
= 218 - 180 : 18
= 218 - 10
= 208
d) ( 328 - 8 ) : 32
= 320 : 32
= 10
a) \(3.5^2+15.2^2-26\div2\)
= 3.25 + 15.4 - 13
= 75 + 60 - 13
= 135 - 13
= 122
b) \(5^3.2-100\div4+2^3.5\)
= 125.2 - 25 + 8.5
= 250 - 25 + 40
= 225 + 40
= 265
c)\(6^2\div9+50.2-3^3.33\)
= 36 : 9 + 100 - 9.33
= 4 + 100 - 297
= 104 - 297
= -193
d)\(3^2.5+2^3.10-81\div3\)
= 9.5 + 8.10 - 27
= 45 + 80 - 27
= 125 - 27
= 98
e) \(5^{13}\div5^{10}-25.2^2\)
= 53 - 25.4
= 125 - 100
= 25
f) \(20\div2^2+5^9\div5^8\)
= 20 : 4 + 5
= 5 + 5
= 10
a, |- 5| . (-7) + 4 . (-9)
= 5 . (-7) + (-36)
= (-35) + (-36)
= -71
b, |-15 + 21|-|-4 - 11|
= 6 - 15
= -9
c, [(-27)+43] + (-7) . 3
= 16 + (-21)
= -5
d, - (- 526) + (- 350) + (- 150) + 74
= 526 + (- 350) + (- 150) + 74
= 526 + (- 500) + 74
= 26 + 74
= 100
e, 2145 - (174 - 2145) + (- 68 + 174)
= 2145 - 174 + 2145 + (- 68) + 174
= 2145 + 2145 - (174 - 174) + (- 68)
= 4290 - 0 + (- 68)
= 4290 + (- 68)
= 4222
a) = 5.(-7)+4.(-9)=-35-36=-71
b) =6-15=-11
c) =16-21=-5
d)=526-350-150+74= (526+74)-(350+150)= 600- 500=100
e) 2145-174+2145-68+174
=2145+2145-68
=4222
g) =25. (-72+21-49)
=25. (-100)=-2500
i, h) tương tự nhé