口算 45+32= 500+300= 450+500= 50+800= 3000﹣1500=35÷7= 360﹣30= 730﹣700= 9×4= 3600﹣600=
计算. 0.25×19+0.75×27 (96.5﹣96.5×0.24﹣0.24)÷73.1.
2.4×7.6+7.6×6.5+7.6+0.76.
计算: (1)13.7×6.5+5.9×13.7﹣12.4×3.7= (2)50×[(0.2+4.8﹣4.8+0.2)÷2]=
×125××8++×24 ×(﹣)÷ 3÷+3÷7+8.9+2+6.10.36×101 20﹣(5.6+4.8)÷1.33.2×(2.15+1.95÷6.5)(+)÷+ 36×(+﹣)
能简算的要简算 5.7×1.4+1.4×4.39.05﹣3.86﹣3.146.84×10.187×2.5+8.7×75.