计算下列各题,能简算的要简算。①2013×0.25+2013×0.75 ②1.25×32×0.25③12×( +﹣)④+( ﹣ )÷
304-275÷(275÷25) (252-14)÷17-10
7.9×11-7.9 0.99×9+0.99
199.8×19.99-199.9×19.97 (10-100÷10)×11=
4.83×0.59+0.41×1.59-0.324×5.9 (346-10)÷16-12
49×50≈89×41≈10×42≈ 20×32≈10×21≈30×32≈