（1）7.5÷（8.43-8.18）×0.26=7.5÷0.25×0.26=30×0.26=7.8；（2）23.17+3.5×0.6=23.17+2.1=25.27；（3）300-（0.48+0.24）÷0.9=300-0.72÷0.9=300-0.8=299.2；（4）32.76+6.3-3.6×0.15=32.76+6.3-0.54=39.06-0.54=38.52．
