5.8×6.5+1.3×40这道算式简便计算?
3个回答
2022-12-05
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5.8×6.5+1.3×40注意观察数字6.5是1.3的5倍
=5.8×5×1.3+1.3×40
=29×1.3+1.3×40
=1.3×(29+40)
=1.3×69
=1.3×(70-1)
=1.3×70-1.3×1
=91-1.3
=89.7
其实一定要注意培养自己的”数感“那么就简单多了,望采纳!
=5.8×5×1.3+1.3×40
=29×1.3+1.3×40
=1.3×(29+40)
=1.3×69
=1.3×(70-1)
=1.3×70-1.3×1
=91-1.3
=89.7
其实一定要注意培养自己的”数感“那么就简单多了,望采纳!
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5.8×6.5+1.3×40
=5.8×6.5+0.65×2×40
=6.5×(5.8+8)
=6.5×(14-0.2)
=6.5×14-6.5×0.2
=91-1.3
=89.7
=5.8×6.5+0.65×2×40
=6.5×(5.8+8)
=6.5×(14-0.2)
=6.5×14-6.5×0.2
=91-1.3
=89.7
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5.8×6.5+1.3×40
=(6-0.2)×6.5+13×4
=6×6.5-0.2×6.5+52
=39-1.3+52
=89.7
=(6-0.2)×6.5+13×4
=6×6.5-0.2×6.5+52
=39-1.3+52
=89.7
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