一块三角形地面积560平方米,高14米,底长多少米?(列方程解答)
简便计算,写出简便过程 (1)54×303 (2)7.7×0.73 (3)26.39×36+2.639×830﹣263.9×1.9 (4)272.4×6.2+2724×0.38 (5)2.04×0.25×7.2×12.5.
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×(+﹣)