用简便方法计算 12*(1\2-1\3-1\4) (11\12-5\7)*7\11 10又49\50*50 (2\7+3\8)*5.6

问题描述:

用简便方法计算 12*(1\2-1\3-1\4) (11\12-5\7)*7\11 10又49\50*50 (2\7+3\8)*5.6

12×﹙1/2-1/3-1/4﹚ =12×1/2-12×1/3-12×1/4 =6-4-3 =﹣1,如果是六年级学生,可能你的运算符号中的减号抄错了 ﹙11/12-5/7﹚×7/11 =11/12×7/11-5/7×7/11 =7/12-5/11 =17/132 10又49/50×50 =10...