Đáp án:
) 2010^5*(x-60) = 2010^6
=> x-60 = 2010^6 / 2010^5 = 2010
=> x = 2010+60 = 2070
b) 720/[41-(2x-5)] = 2^3*5
=> 720 / (46-2x) = 40
=> 46 - 2x = 720/40 = 18
=> 2x = 46-18 = 28
=> x = 14
c) 5x+3*(10-x) + x =45
=> 5x + 30 - 3x + x =45
=>3x = 45-30=15
=> x =15/3 = 5
d) 1+2+3+...+x = 500500
=> (x+1)* [(x-1)*1+1] /2 = 500500
=> x*(x+1) = 500500*2 = 1001000
=> x*(x+1) = 1000*1001
=> x = 1000
a) 5^3*4^3-32*5^3 = 5^3 * 2^6 - 2^5 * 5^3 = 5^3 * 2^5 = 4000 b) 21*2020+2020*79 = 2020 * (21+79) =2020*100 =202000 c)120-[127 - (6-3)^3] = 120- [127-27] =120-100 =20
