看谁算的最准确.40×5= 58÷2= 250×4=600÷3= 10×63= 720÷8=400÷5= 3×23= 10×10=20×32= 840÷4= 690÷3=350÷7= 70×60= 60×50=﹣= = 30+50=
643﹣48﹣12﹣40.
简便计算.0.125×3.2×2.5 102×0.45.
用简便方法计算:304×22; 48×101﹣48; (30+2)×15.
怎样算简便就怎样算①9.5﹣9.5×(9.5﹣9.5)÷9.5②12.5×4×0.25×80③45.893﹣(3.7+25.893)④20﹣[8.07+(7.54﹣3.86)].
简便计算.①0.8×7.7+2.3×0.8 ②36×10.1.