(1)
34×2.83+1.17×34+0.75
=34×2.83+34×1.17+34×1
=34×(2.83+1.17+1)
=34×4
=3
(2)
25×18+4×320
=0.4×18+4×320
=7.2+1280
=1287.2
(3)
5-5×25+35
=5-2+35
=3+35
=3又35
(4)
34+1115+14-115
=(34+14)+(1115-115)
=1+10/15
=1又2/3
(1)
34×2.83+1.17×34+0.75
=34×2.83+34×1.17+34×1
=34×(2.83+1.17+1)
=34×4
=3
(2)
25×18+4×320
=0.4×18+4×320
=7.2+1280
=1287.2
(3)
5-5×25+35
=5-2+35
=3+35
=3又35
(4)
34+1115+14-115
=(34+14)+(1115-115)
=1+10/15
=1又2/3