|
| (1)101×39 =(100+1)×39 =100×39+1×39 =3900+39 =3939; (2)4×60×50×8 =(4×60)×(50×8) =240×400 =96000; (3)35×8+35×6-4×35 =35×(8+6-4) =35×10 =350; (4)89.6-5.22-4.78 =89.6-(5.22+4.78) =89.6-10 =79.6; (5)3.25-(0.86+0.25) =3.25-0.86-0.25 =3.25-0.25-0.86 =3-0.86 =2.14; (6)1.31+4.6+0.69+3.4 =(1.31+0.69)+(4.6+3.4) =2+8 =10. |
关注公众号回复:奥数答案
即可免费获得密码查看答案

[ ]
a.12×(4+25)[ ]
a. 47+(14×5)(1)35+65=
65+35=
35+65○65+35