小刚买回8分邮票和4分邮票共100张,共付出6.8元,问小刚买回这两种邮票各多少张?
递等式计算,能简算的要简算0.11×1.8+8.2×0.11 0.8×(3.2﹣2.99÷2.3) (8.1﹣5.4)÷3.6+85.7.
下面各题怎样算简便就怎样算.18.65﹣3.7+1.35﹣6.3 30×[3.61÷(7.2﹣5.3)]36÷[1.44×(0.1﹣0.05)] (16.5×3+3×7.5)÷6.
神机妙算:0.8×6.5﹣×3.5 (+)×45 1﹣÷+25×1.25×32 99×+ 1﹣﹣.
(1)79.76+84.7×0.2 (2)15.37+28.44+12.56(3)(2.3×8.8﹣2.3×0.8)×1.25 (4)[5.2﹣(2.5+7.5÷5)]×1.2.
用递等式计算,能简便计算的用简便方法计算(1)37.7÷13+1.8×2.4(2)1.25×3.2×0.25(3)1.06×(2.9+1.6)÷0.01(4)6.27×5.2+5.8×6.27﹣6.27(5)50.5÷[(15.6﹣3.5×4)÷3.2].