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1)2345 - 1000 : [19 - 2(21 - 18)2]
=2345 - 1000 : [19 - 2 . 32]
=2345 - 1000 : 1
=2345 - 1000
=1345
a) 2010 - 2000 : [486 - 2(72 - 6)]
= 2010 - 2000 : [486 - 2(49 - 6)]
= 2010 - 2000 : [486 - 2 . 43]
= 2010 - 2000 : [486 - 86]
= 2010 - 2000 : 400
= 2010 - 5
= 2005
b) 2345 - 1000 : [19 - 2(21 - 18)2 ]
= 2345 - 1000 : [19 - 2 . 32 ]
= 2345 - 1000 : [19 - 18]
= 2345 - 1000 : 1
= 2345 - 1000
= 1345
c) 128 - [68 + 8(37 - 35)2 ] : 4
= 128 - [68 + 8 . 22 ] : 4
= 128 - [68 + 32 ] : 4
= 128 - 100 : 4
= 128 - 25
= 103
d) 568 - {5[143 - (4 - 1)2 ] + 10} : 10
= 568 - {5[143 - 9 ] + 10} : 10
= 568 - {5 . 134 + 10 } : 10
= 658 - {670 + 10 } : 10
= 658 - 680 : 10
= 658 - 68
= 590
a, \(11^{25}\div11^{23}-3^5\div\left(1^{10}+2^3\right)-60\)
\(=11^{25}\div11^{23}-3^5\div\left(1+8\right)-60\)
\(=11^{25}\div11^{23}-3^5\div3^2-60\)
\(=11^2-3^3-60\)
\(=121-27-60\)
\(=94-60=34\)
b, \(2345-1000\div\left[19-2\left(21-18\right)^2\right]\)
\(=2345-1000\div\left[19-2.3^2\right]\)
\(=2345-1000\div\left[19-2.9\right]\)
\(=2345-1000\div1=2345-1000=1345\)
c, \(128-\left[68+8\left(37-35\right)^2\right]\div4\)
\(=128-\left[68+8.2^2\right]\div4\)
\(=128-\left[68+8.4\right]\div4\)
\(=128-\left[68+32\right]\div4\)
\(=128-100\div4=128-25=103\)
d, \(107-\left\{38+\left[7.3^2-24\div6+\left(9-7\right)^3\right]\right\}\div15\)
\(=107-\left\{38+\left[7.9-4+2^3\right]\right\}\div15\)
\(=107-\left\{38+\left[63-4+8\right]\right\}\div15\)
\(=107-\left\{38+\left[59+8\right]\right\}\div15\)
\(=107-\left\{38+67\right\}\div15\)
\(=107-105\div15\)
\(=107-7=100\)
e, \(50-\left[50-\left(2^3.5\right)\div2+3\right]\)
\(=50-\left[50-8.5\div2+3\right]\)
\(=50-\left[50-40\div2+3\right]\)
\(=50-\left[50-20+3\right]\)
\(=50-\left[30+3\right]\)
\(=50-33=17\)
Bài 2 :
a, \(5\left(x-9\right)=350-5^2\)
\(5\left(x-9\right)=350-25\)
\(5\left(x-9\right)=325\)
\(x-9=325\div5\)
\(x-9=65\)
\(\Rightarrow x=65+9\)
\(\Rightarrow x=74\)
Vậy x = 74
b, \(2\left(x-51\right)=2.2^3+20\)
\(2\left(x-51\right)=16+20\)
\(2\left(x-51\right)=36\)
\(x-51=36\div2\)
\(x-51=18\)
\(\Rightarrow x=18+51\)
\(\Rightarrow x=69\)
Vậy x = 69
c, \(2.3^x=162\)
\(\Rightarrow2.3^x=2.3^4\)
\(\Rightarrow3^x=3^4\)
\(\Rightarrow x=4\)
Vậy x = 4
a: \(=47-\left[\left(45\cdot16-25\cdot12\right):14\right]\)
\(=47-30=17\)
b: \(=50-\left[6+34\right]\)
=50-40
=10
\(a.2345-1000:\left[19-2\left(21-18\right)^2\right]\)
\(=2345-1000:\left[19-2\left(3\right)^2\right]\)
\(=2345-1000:\left[19-2.9\right]\)
\(=2345-1000:\left[19-18\right]\)
\(=2345-1000:1\)
\(=2345-1000\)
\(=1345\)
a) 2345 – 1000 : [19 – 2(21 – 18)2]
= 2345 – 1000 : [19 – 2(3)2 ]
= 2345 – 1000 : [19 – 2 . 9 ]
= 2345 – 1000 : [19 – 18]
= 2345 – 1000 : 1
= 2345 – 1000
= 1345
\(b.128-\left[68+8\left(37-35\right)^2\right]:4\)
\(=128-\left[68+8\left(2\right)^2\right]:4\)
\(=128-\left[68+8.4\right]:4\)
\(=128-\left[68+32\right]:4\)
\(=128-100:4\)
\(=128-25\)
\(=103\)
a) 2345-1000 : [19-2(21-18)^2]
=2345-1000: [19-2(3)^2]
=2345-1000: (19-2.9)
=2345-1000: (19-18)
=2345-1000: 1
2345-1000
=1345
b )
128- [68+8(37-35)^2] :4
=128-[68+8 (2)^2]:4
=128-(68+8.4):4
=128-(68+32) :4
= 128- 100 :4
=128-25
=103
c)
568- {5 [143-(4-1)^2]+10} :10
=568-{5[143-(3)^2] +10 } :10
=568-[5(143-9)+10]:10
= 568-(5.134+10) :10
= 568- ( 670+10) :10
=568- 680:10
=568-68
=500
d
107- {38+[7.3^2-24:6 +(9-7)^3 ]}:15
=107- {38+ [7.9-24:6 + 2^3]}:15
= 107- { 38+ [ 63-4+8 ]} :15
= 107 - ( 38+ 67) :15
=107 - 105 :15
= 107-7
=100
e
307- [(180-160) :2^2 +9 ] :2
= 307- ( 20 : 4 +9) :2
= 307 - ( 5+9) :2
=307 - 14 :2
=307-7
=300