分数加法几何演示
2016-10-30 10:54
本GeoGebra范例动态演示了分数加法的计算过程与几何直观。通过多边形面积或线段长度的拼接，结合FractionText等命令，直观展示两个分数相加时的通分与分子相加原理。适用于基础数学教学，帮助学生理解分数运算的几何意义与代数规则。
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小四_分数
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<show object="true" label="true" ev="4"/>
<condition showObject="t2 ≟ 1 ∧ (b1 / a1 + b2 / a2 > 1)"/>
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<input a0="B'" a1="B' + ((b2 / a2 * l), 0)"/>
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<element type="segment" label="k">
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<input a0="B' + ((b2 / a2 * l), h)" a1="B' + (0, h)"/>
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<element type="segment" label="m">
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<command name="If">
<input a0="b1 / a1 + b2 / a2 ≥ 1" a1="true" a2="false"/>
<output a0="improper"/>
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<element type="boolean" label="improper">
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<show object="false" label="true"/>
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<command name="FractionText">
<input a0="b1 / a1 + b2 / a2"/>
<output a0="text19"/>
</command>
<element type="text" label="text19">
<symbolic val="true" />
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<command name="FractionText">
<input a0="b1 / a1 + b2 / a2 - 1"/>
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<element type="text" label="text20">
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<checkbox fixed="true"/>
<ggbscript onUpdate="SetValue[ans2, false]"/>
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<element type="boolean" label="ans2">
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<element type="list" label="list10">
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<expression label="text17" exp=""\frac{" + (LaTeX[(b1 * c1)]) + "}{" + (LaTeX[(a1 * c1)]) + "}+\frac{" + (LaTeX[(b2 * c2)]) + "}{" + (LaTeX[(a2 * c2)]) + "}"" />
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<expression label="text21" exp=""=" + (LaTeX[If[ans1, text17, ""]]) + """ />
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<element type="button" label="button2">
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<caption val="Reset"/>
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