A.都扩大2倍 |
B.其中一个因数扩大2倍,另一个缩小2倍 |
C.都缩小2倍 |
D.把其中一个因数扩大2倍,另一个保持不变 |
A.22117788 | B.2222177778 | C.222221778 | D.2222177788 |
A.222111 | B.22221111 | C.2221111 |
A.225 | B.625 | C.115 | D.100 |
A. | B. | C. |
A.17与60 | B.60与85 | C.15与22 | D.22与15 |
A.444444 | B.666666 | C.888888 | D.999999 |
A.× | B.÷ | C.÷ |
A.109986 | B.119986 | C.139986 |
A.480÷[220-(250-50)]=480÷[220-200]=480÷20=24 |
B.(350×18+6000)÷60=6300+6000÷60=6400 |
C.78-25+15=78-40=38 |