68.5+31.5除以(0.29+0.41) 如何简算?
问题描述:
68.5+31.5除以(0.29+0.41) 如何简算?
答
68.5+31.5÷(0.29+0.41)
=68.5+31.5÷0.7
=68.5+31.5×10/7
=(68.5+31.5)+31.5×3/7
=100+13.5
=113.5