简便计算。
18.76-3.47-0.53 70.8-1.25-1.75
4.02-3.5+0.98 4.25-0.83+0.75 23.04-0.8-13.4-6.2
15.13+4.92-5.13 72.6-(22.6+3.45) 30.99-(8.5+15.99)
18.76-3.47-0.53 70.8-1.25-1.75
4.02-3.5+0.98 4.25-0.83+0.75 23.04-0.8-13.4-6.2
15.13+4.92-5.13 72.6-(22.6+3.45) 30.99-(8.5+15.99)
简便计算。
4.9+0.1-4.9+0.1 34.02+13.5+0.98
5.6+2.7-4.4 5.17-1.8-3.2
9.95-(4.95+3.14) 8.43+2.87+0.57+0.13
4.9+0.1-4.9+0.1 34.02+13.5+0.98
5.6+2.7-4.4 5.17-1.8-3.2
9.95-(4.95+3.14) 8.43+2.87+0.57+0.13
你能想出简便方法来计算下面各题吗?
25×5+74×5+5 6.74+12.62+24.38+3.26
87-2.123-0.877 30.65-(7.65+5.4)
(40+8)×125 32×38+32×62
25×5+74×5+5 6.74+12.62+24.38+3.26
87-2.123-0.877 30.65-(7.65+5.4)
(40+8)×125 32×38+32×62
用转化的方法计算。
630×0.27+1.9×21 2.4×4.6+6.5×4.6+4.6×1.1
0.0495×2500+495×0.24+51×4.95
630×0.27+1.9×21 2.4×4.6+6.5×4.6+4.6×1.1
0.0495×2500+495×0.24+51×4.95
