东方project秦心:2.2*3.83+11/5*5.17+11/5能简算吗?怎么算?
来源:百度文库 编辑:高考问答 时间:2024/06/01 11:50:17
分数小数混合运算时要注意是将分数化为小数或小数化为分数后看看能否用上运算定律。
这题中将11/5化为2.2就可以了
原式=2.2×3.83+2.2×5.17+2.2×1
=2.2×(3.83+5.17+1)
=2.2×10
=22
2.2*3.83+11/5*5.17+11/5
=(11/5)*3.83+ 11/5*5.17+11/5
=( 11/5) *(3.83+5.17+1)
=(11/5)*10
=22