6.8x3.2+58x0.68+6.8=6.8x3.2+5.8x6.8+6.8=（3.2+5.8+1）x6.8=10x6.8=68
6.8×3.2+58x0.68+6.8=6.8×3.2+5.8×6.8+6.8=6.8×(3.2+5.8+1)=6.8×10=68
原数等于6.8×（3.2+5.8+1）=68~回答完毕~~\(^o^)/~祝学习进步~~~
