食堂第一次运进大米5袋,面粉9袋,共重850千克。第二次运进大米7袋,面粉3袋,共重710千克。大米和面粉每袋各重多少千克?
7.02×900×0.6 0.035÷0.7÷0.5 13.6﹣13.6×0.7 5.62+3.1×0.6+3.38 (25﹣1.25×5)÷2.5 8.1×0.3+1.8×0.3+0.03.
199×0.612.5×3.7+4.3×2.50.8×62.3×12.5 5.2×10.10.25×13.7×0.42.5×40.4.
(1)60.28+0.72×4.3 (2)6.37﹣0.37×16 (3)3.8×99 (4)2.5×9×0.4×1.1 (5)2.6×(10.6﹣9.72) (6)1.25×888.
脱式计算(能简算的写出主要简算过程). ①40.5﹣2.6×7.8 ②80.52÷6.6+2.48 ③2.5×3.6+6.4×2.5 ④3.2×(3.9÷0.26+1.5)
脱式计算. 4.67﹣(2.98+0.67) 73.8×16﹣73.8×6.