365+12+135+88=
166+(538+34)=
468+(390+32)=
85+15+82+18=
213+8+92+487=
217+83+142+258=
249+(162+351)=
227+73+352+248=
358+142+52+48=
解答如下:
(1)计算18+13+2=?
18+13+2=(18+2)+I3=33
(2)计算17+83+15=?
17+83+15=(17+83)+15
=100+15=115
(3)计算43+58+57+42=?
43+58+57+42=(43+57)+(58+42)=200
(4)3.16+4.7+5.3+1.84=?
3.16+4.7+5.3+1.84
=(3.16+1.84)+(4.7+5.3)=5+10=15
(5)60+81+9+40=?
60+81+9+40
=(60+40)+(81+9)
=100+90=190