1、练一练: 先说出运算顺序,再计算

=169.77+94.3-4.309=264.07-4.309=259.761

=9.26- 〔8.9-5.26 〕=9.26-3.64=5.62

=28.03-9.125+14.75=18.905+14.75=33.655

=32.5-11.2+8.25=21.3+8.25=29.55