寒假作业（数学）口算608= 2430= 966=7012= 5406= 1850=42070= 3941 69571629471 47981 608=2430= 966= 7012=52+48= 1000700= 450450=35+17= 230+40= 425+575=900-200= 4207= 99090=170-20= 2540= 880+20=568= 63+37= 30006=2004= 910600= 17020=1128= 120+360= 630+350=63020= 2807= 16008=190+110= 3504= 40005=307+622= 8008= 21040=440-40= 360300= 3190=8109= 354+645= 90008000 =1007= 700+300= 450+350=54006= 250050= 720+800=740200= 630230= 720+80= 480400= 63009= 2404= 56050= 7070 = 3620 = 130+250= 910+210= 24004= 7505= 1258 = 1250= 7260 25040 7320 7540 8150 15443200 75500 600507040 9250 30147260 25040 73207540 8150 15443200 75500 600507040 9250 301445050 65050 150025 32020 93030 56080 8442 52013 6004088020 9113 3401791070 75005 26013 42030 250025 230020 78030 420050 78030 440050 640032 47002087030 130050 64020 35050 270050 70020 20025 10020 122020 63070 68034 200025369030 28070 30050 28070 39030 57030 75050 72090 82020 78030 54090 3903050025 45030 230020 270050 285050 110050 122061 250025 440025 130020 240012 990033134= 1305= 182= 165= 425= 1307= 1406= 456= 156= 283=1207= 3103= 2402= 185= 127=