3.4×2.5×1.8的简便计算?
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简便计算
3.4×2.5×1.8
=3.4×(2.5×6)×0.3
=3.4×0.3×15
=1.02×15
=1.02×10+1.02×5
=10.2+5.1
=15.3
3.4×2.5×1.8
=3.4×(2.5×6)×0.3
=3.4×0.3×15
=1.02×15
=1.02×10+1.02×5
=10.2+5.1
=15.3
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3.4x2.5x1.8
=(1.7x2)x2.5x(2x0.9)
=1.7x2x2.5x2x0.9
=1.7x0.9x(2x2)x2.5
=(1.3+0.4)x(1.3-0.4)x4x2.5
=(1.3²-0.4²)x(4x2.5)
=(1.69-0.16)x10
=1.53x10
=15.3
=(1.7x2)x2.5x(2x0.9)
=1.7x2x2.5x2x0.9
=1.7x0.9x(2x2)x2.5
=(1.3+0.4)x(1.3-0.4)x4x2.5
=(1.3²-0.4²)x(4x2.5)
=(1.69-0.16)x10
=1.53x10
=15.3
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原式=3.4x2.5x1.8
=1.7x2x2.5x0.9x2
=2x2x2.5x1.7x0.9
=4x2.5x1.7x(1-0.1)
=10x1.7x1-10x1.7x0.1
=17-1.7
=15.3
=1.7x2x2.5x0.9x2
=2x2x2.5x1.7x0.9
=4x2.5x1.7x(1-0.1)
=10x1.7x1-10x1.7x0.1
=17-1.7
=15.3
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3.4×2.5×1.8=1.7×2×2.5×2×0.9=1.7×9×10=17×9=153
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3.4×2.5×1.8
=1.7×2×2.5×0.2×9
=1.7×9×(2×2.5×0.2)
=1.7×9×1
=1.7×10-1.7
=17-1.7
=15.3
=1.7×2×2.5×0.2×9
=1.7×9×(2×2.5×0.2)
=1.7×9×1
=1.7×10-1.7
=17-1.7
=15.3
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