Question

(2¹⁷+15⁴). (3¹⁹-2¹⁷).(2⁴-4²)

100+98+96+.........+4+2-97-95-....-3-1

Đúng thì được 2 tích lun

Answer 1

a,\(\left(2^{17}+15^4\right).\left(3^{19}-2^{19}\right).\left(4^2-2^4\right)=\left(2^{17}+15^4\right).\left(3^{19}-2^{19}\right).\left(16-16\right)\)

\(=\left(2^{17}+15^4\right).\left(3^{19}-2^{17}\right).0=0\)

b,\(100+98+96+...+4+2-97-95-....-3-1\)

\(=100+98-97+96-95+......+4-3+2-1\)

\(=100+\left(98-97\right)+\left(96-95\right)+.....+\left(4-3\right)+\left(2-1\right)\)

\(=100+49\times1=100+49=149\)