0.25×3.1+0.75×6.9有简便用法吗?
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原式=0.25x3.1+(1-0.25)x6.9
=0.25x(3.1-6.9)+6.9
=0.25x-3.8+6.9
=6.9-0.25x(4-0.2)
=6.9-1+0.05
=5.9+0.05
=5.95
=0.25x(3.1-6.9)+6.9
=0.25x-3.8+6.9
=6.9-0.25x(4-0.2)
=6.9-1+0.05
=5.9+0.05
=5.95
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0.25×3.1+0.75×6.9
=0.25×3.1+0.25×3×6.9
=0.25×(3.1+3×6.9)
=1/4×23.8
=5.95
=0.25×3.1+0.25×3×6.9
=0.25×(3.1+3×6.9)
=1/4×23.8
=5.95
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0.25×3.1+0.75×6.9
=0.25×(3+0.1)+0.25×3×(7-0.1)
=0.25×(3+0.1+3×7-3×0.1)
=0.25×(24-0.2)
=6-0.05
=5.95
=0.25×(3+0.1)+0.25×3×(7-0.1)
=0.25×(3+0.1+3×7-3×0.1)
=0.25×(24-0.2)
=6-0.05
=5.95
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