21/13乘以()=()乘以15/7=9/2比()=1
27046=2乘以( )+7乘以( )+4乘以( )+6乘以( )
=3乘以2乘以1,=4乘以3乘以2乘以1,=5乘以4乘以3乘以2乘以1,那么100!除以99!
(21乘以7分之3+7分之4乘以21)乘以4分之1=简算
100乘以()=()乘以7=9分之8乘以()=1
1.2乘以(-1又5分之4)乘以(-2.5)乘以(-9分之7)=?
1+2乘以3+4乘以5+6乘以7+8乘以9=1005 在上面各式当中添上适当的括号使等式成立
观察1乘以2乘以3乘以4+1=25=5² 2乘以3乘以4乘以5+1=121=11²
12乘以231=132乘以21 则 12乘以462= 乘以 ,18乘以891= 乘以 ,24乘以231= 乘以 .
(1+40%)乘以X乘以80%—X=15
70642=7乘( )+6乘( )+4乘以( )+2乘以( )
7乘以9=63,8乘以8=64,11乘以13=143,12乘以12=144,24乘以26=624,25乘以25=625.
8分之5乘以( )=( )乘以3分之2=0.1乘以( )=( )乘以12=1