计算下面各题．（能简算的要简算，并写出主要的计算过程）
6.7×7.3+6.7×1.7+6.71.25×0.25×3221.36÷0.8﹣12.9
25.6﹣25.6×0.87.65×101﹣7.653.73÷2.5÷4．
脱式计算，能简算的要简算．
1.69÷1.3+2.5×0.4 375+450÷18×25 2×1.4+2×1.683×102﹣83×2．
选择最适合的方法，写出递等式计算的过程
39.6﹣6.53+3.47．0.0125×32×0.25．[90﹣（8.25÷0.6+1.25）]×0.01．
38×2.5+76+38×5.5．3.6×31.4+43.9×6.4． 5.7×5.7+5.7×4.2+5.7×0.1．
计算，能简算的要简算
7.26+3.2÷2.514.6﹣4.6×2.80.8+0.8+…+0.8+15×0.2 15个0.8
14.5×1024.05÷0.5﹣1.149.99×99+9.99．
递等式计算，能简算的用简便方法算：
8.46﹣8.46÷4+4.98543.56÷12.56.4×3.28+4.6×3.28﹣3.28 99.9×10.1．
