3.4×2.5×1.8的简便计算?
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=2.5×(1+0.8)×3.4
=(2.5+2)×3.4
=4.5×(3+0.4)
=13.5+1.8
=15.3
=(2.5+2)×3.4
=4.5×(3+0.4)
=13.5+1.8
=15.3
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解:运用简便运算得
原式=3.4x0.5x5x2x0.9
=(3.4x5)x(0.5x2)x0.9
=17x1x0.9
=15.3
原式=3.4x0.5x5x2x0.9
=(3.4x5)x(0.5x2)x0.9
=17x1x0.9
=15.3
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3.4×2.5×1.8
=1.7×2×0.5×5×0.2×9
=1.7×1×1×9
=1.7×9
=15.3
=1.7×2×0.5×5×0.2×9
=1.7×1×1×9
=1.7×9
=15.3
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原式=1.7×2×2.5×1.8
=1.7×(2×2.5)×2×0.9
=1.7×5×2×0.9
=1.7×10×0.9
=17×(1-0.1)
=17-1.7
=15.3
=1.7×(2×2.5)×2×0.9
=1.7×5×2×0.9
=1.7×10×0.9
=17×(1-0.1)
=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×(2×2.5×2)×0.9
=1.7×10×0.9
=17×0.9
=15.3
=1.7×2×2.5×2×0.9
=1.7×(2×2.5×2)×0.9
=1.7×10×0.9
=17×0.9
=15.3
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