Alo alo lm bài 2 nè. 60 điểm sẽ giành cho ai đây ạ?

Đáp án: `a)\ 51;\ b)\ 450;\ c)\ 100;\ d)\ 16;\ e)\ 10;\ f)\ 40;\ g)\ 2;\ h)\ 51`

Giải thích các bước giải:

`a)\ 2^3-5^3:5^2+12.2^2=8-5^(3-2)+12.4=8-5+48=51`

`b)\ 5.[(85-35:7):8+90]-50`

`=5.[(85-5):8+90]-50`

`=5.(80:8+90)-50`

`=5.(10+90)-50`

`=5.100-50=500-50=450`

`c)\ 2.[(7-3^3:3^2):2^2+99]-100`

`=2.[(7-3):4+99]-100`

`=2.(4:4+99)-100=2.(1+99)-100`

`=2.100-100=200-100=100`

`d)\ 2^7:2^2+5^4:5^3. 2^4-3.2^5=2^(7-2)+5^(4-3). 16-3.32`

`=2^5+5^1. 16-96=32+80-96=16`

`e) 2.[(95+5^2:5):2^2+180]-2^2. 10^2`

`=2.[(95+5^(2-1)):4+180]-4. 100`

`=2.[(95+5):4+180]-4. 100=2.(100:4+180)-4. 100`

`=2.(25+180)-4. 100 =2.205-4. 100=410-400=10`

`f)\ 3^5 . 3^7:3^10+5.2^4-7^3:7`

`=3^(5+7-10)+5.16-7^(3-1)`

`=3^(2)+5.16-7^(2)=9+80-49=40`

`g)\ 2^2. 5.[(5^2+2^3):11-2]-3^2. 2`

`=4. 5.[(25+8):11-2]-9. 2`

`=4. 5.(33:11-2)-9. 2=4. 5.(3-2)-9. 2`

`=4. 5.1-9. 2=20-18=2`

`h)\ 5.[(92+2^5:2^2):5^2+2^4]-7^2`

`=5.[(92+2^(5-2)):25+16]-49 `

`=5.[(92+2^3):25+16]-49=5.[(92+8):25+16]-49`

`=5.(100:25+16)-49`

`=5.(4+16)-49=5.20-49=100-49=51`