234×3+234×4+234×3=234×
29×9+6×29-29×5=29×
45×260= 45×26=
8吨30千克=吨 12.06公顷=平方米
284g0.284kg
0.510.5099
0.5 -3 4 -1.5 -4 3.5
9.09﹣0.9= 0.8×0.32= 50÷10%= 0.125×32× =
7÷14%= = = 2.5+2.5÷5=