12.35-37-123.5x1.9+1.235x820=?用简便计算
问题描述:
12.35-37-123.5x1.9+1.235x820=?用简便计算
答
12.35×37-12.35×19+12.35×82
12.35×(37-19+82)
12.35×(16+82
12.35×98
12.35(100-2)
12.35×100-12.35×2
1235-24.7
1210.3你确定吗?嗯