1、(4.2*10的6次方)*(3*10的6次方)
=12.6×10¹²
=1.26×10¹³
2、(4*10的5次方)*(5*10的6次方)*(3*10的4次方)
=60×10¹⁶
=6×10¹⁷
3.(2*10的3次方)*(8*10的2次方)
=16×10⁵
=1.6×10⁶
S=5a×3a-(3b-b)(5a-3a)
=15a²-4a²
=11a²
1、(4.2*10的6次方)*(3*10的6次方)
=12.6×10¹²
=1.26×10¹³
2、(4*10的5次方)*(5*10的6次方)*(3*10的4次方)
=60×10¹⁶
=6×10¹⁷
3.(2*10的3次方)*(8*10的2次方)
=16×10⁵
=1.6×10⁶
S=5a×3a-(3b-b)(5a-3a)
=15a²-4a²
=11a²