简便计算题,
问题描述:
简便计算题,
①17.8 × 32 + 17.8 × 72 - 17.8 × 4
② 9 × 12 + 9 × 12
答
①17.8 × 32 + 17.8 × 72 - 17.8 × 4
=17.8×(32+72-4)
=17.8×100
=1780 ② 9 × 12 + 9 × 12
=9×12×2
=108×2
=216