1. 直接写出得数。
$30×2=$ $130×4=$ $50×4×8=$
$80×6=$ $180×7=$ $5×20×9=$
$50×4=$ $5×140=$ $30×6×5=$
$40×6=$ $160×6=$ $70×5×2=$
$6×90=$ $430×3=$ $40×5×3=$
$320×3=$ $200×8=$ $14×5×4=$
$30×2=$ $130×4=$ $50×4×8=$
$80×6=$ $180×7=$ $5×20×9=$
$50×4=$ $5×140=$ $30×6×5=$
$40×6=$ $160×6=$ $70×5×2=$
$6×90=$ $430×3=$ $40×5×3=$
$320×3=$ $200×8=$ $14×5×4=$
答案
$30×2=60$
$130×4=520$
$50×4×8=1600$
$80×6=480$
$180×7=1260$
$5×20×9=900$
$50×4=200$
$5×140=700$
$30×6×5=900$
$40×6=240$
$160×6=960$
$70×5×2=700$
$6×90=540$
$430×3=1290$
$40×5×3=600$
$320×3=960$
$200×8=1600$
$14×5×4=280$
$130×4=520$
$50×4×8=1600$
$80×6=480$
$180×7=1260$
$5×20×9=900$
$50×4=200$
$5×140=700$
$30×6×5=900$
$40×6=240$
$160×6=960$
$70×5×2=700$
$6×90=540$
$430×3=1290$
$40×5×3=600$
$320×3=960$
$200×8=1600$
$14×5×4=280$
2. 脱式计算。
$25×8×4$ $320×(2×4)$ $248×2×2$
$21×5×6$ $160×2×5$ $230×4×3$
$28×3×5$ $108×3×4$ $180×3×5$
$25×8×4$ $320×(2×4)$ $248×2×2$
$21×5×6$ $160×2×5$ $230×4×3$
$28×3×5$ $108×3×4$ $180×3×5$
答案
$25×8×4$
$=200×4$
$=800$
$320×(2×4)$
$=320×8$
$=2560$
$248×2×2$
$=496×2$
$=992$
$21×5×6$
$=105×6$
$=630$
$160×2×5$
$=320×5$
$=1600$
$230×4×3$
$=920×3$
$=2760$
$28×3×5$
$=84×5$
$=420$
$108×3×4$
$=324×4$
$=1296$
$180×3×5$
$=540×5$
$=2700$
$=200×4$
$=800$
$320×(2×4)$
$=320×8$
$=2560$
$248×2×2$
$=496×2$
$=992$
$21×5×6$
$=105×6$
$=630$
$160×2×5$
$=320×5$
$=1600$
$230×4×3$
$=920×3$
$=2760$
$28×3×5$
$=84×5$
$=420$
$108×3×4$
$=324×4$
$=1296$
$180×3×5$
$=540×5$
$=2700$
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