| 450-140= | 25÷7= | 900+238= | 600-9×8= | | 90-7×5= | 26+30-28= | 48÷（2+4）= | 780-772= | | 26+24= | 80-30= | 78-26= | -= | | (++) × 24= | 0.25×2.69×4= | 10-2.87-7.13= | ÷24= | | 3÷= | 0.87-0.49 | 4.9×0.7= | ÷= | | ÷= | ÷= | ×= | 2+= | | （25+4）×4= | 12.37-3.25-6.75= | 3/14×6= | 0.51÷17= | | 14-7.4= | 5.2÷1.3= | 25×12= | ÷= | | ÷= | 2.5-2= | 36-29= | 120÷4= | | 300+25= | 630-30= | 4×50= | 15.9+10.8= | | 26×13= | 24÷4+56÷4= | 8-2.5= | 12×2.5= | | 2吨50千克=______吨． |
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