239×101的简便计算=239x(100+1)=239x100+239=23900+239=24139
239x101 = 239x(100+1) = 239x100 + 239x1 = 23900 +239 = 24139
239X101=239X(100+1)=239X100+239=23900+239=24139
=239×(100+1)=239×100+239=23900+239=24139