四年级简便运算:284+636-365+126 (180-140)×7-160 15×4×25×6

问题描述:

四年级简便运算:284+636-365+126 (180-140)×7-160 15×4×25×6

284+636-365+126 (180-140)x7-160 15x4x25x6 =284+126+636-365 =40x7-160 =4x25x15x6 =410+636-365 =180-160 =100x15x6 =1046-365 =20 =1500x6 =681 =9000