画□,使□得个数是☆的2倍。☆☆☆☆
看看谁的办法妙!4.8+2.71+5.2+7.29 8.47﹣3.56﹣1.44 27.6﹣(7.6+3.25)79.86+99.9 159﹣(62.39+58) 72.8+(72.8﹣8.25)
计算下面各题.0.24+3.6×5 1.82+3.89+0.18 20﹣1.32﹣2.68 (4+0.4)×0.25 0.25×7×4 0.48×0.7+0.52×0.728.6×101﹣28.6 0.25×1.25×32.
用递等式计算,能简便计算的要简算.(1)2.01×1.53÷0.18(2)5.86×99.4+5.86×0.6(3)2.2×2.2+2.2×7.8(4)0.25×(4.83﹣0.85)(5)(12.5+1.25+0.125)×8(6)(148.4﹣90.85)÷2.5.
0.25×0.99×40.
1.5×1.3×4 2.7+3.1+2.9+3.2 25﹣4.9﹣6.13.5×4.8+2.2×2.4 131+132+130+129 (13+5.2)÷1.3.