图
=0.625X(5.8十3.2十1) =0.625X10 =6.25
0.625×5.8+5/8×3.2+62.5% =0.625x5.8+0.625x3.2+0.62
101X92-92 =（101-1）x92 =100x92 =9200 18.8-2/5-5
2+3.2=5.2 0.72÷8=0.09 5.8÷2=2.9 3.6÷7.2=0.5