数学高手帮帮忙 5
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51乘399除以17
=51÷17×399
=3×(400-1)
=3×400-3×1
=1200-3
=1197
55乘10+450乘6
=550+2700
=3250
=51÷17×399
=3×(400-1)
=3×400-3×1
=1200-3
=1197
55乘10+450乘6
=550+2700
=3250
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展开全部
51×399÷17
=51÷17×399
=3×(400-1)
=3×400-3×1
=1200-3
=1197
55×10+450×6
=5×11×10+50×9×6
=50×11+50×54
=50×65
=50×(60+5)
=3000+250
=3250
55×10+450×6
=550+(550-100)×6
=550+550×6-100×6
=3250
=51÷17×399
=3×(400-1)
=3×400-3×1
=1200-3
=1197
55×10+450×6
=5×11×10+50×9×6
=50×11+50×54
=50×65
=50×(60+5)
=3000+250
=3250
55×10+450×6
=550+(550-100)×6
=550+550×6-100×6
=3250
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评论
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