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Editing a Embedded answers (Cloze) - math & science question by WIRIS
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<p><span style="color: #003300;"><strong>En la progressió aritmètica a<sub>n</sub>, a<sub>#i_1</sub> = #t_1 i a<sub>#i_2</sub> = #t_2.</strong></span></p> <p><span style="color: #003300;"> <strong>Calcula a</strong><sub>1</sub><strong>: </strong>{1:SA: ~=#a_1}</span></p> <p><span style="color: #003300;"> <strong>Calcula la suma dels #i_3 primer termes: S</strong><sub>#i_3</sub><strong>: </strong>{1:SA: ~=#S}</span></p> <p><strong><span style="color: #800080;"> </span></strong></p>
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<p><span style="color: #0000ff;"><strong> <span style="color: #0000ff;"><span style="color: #0000ff;"><strong>Entre els dos termes, hi ha #i_2 - #i_1 = #i diferències que valen #D. Es pot doncs trobar quant val una diferència, i després el primer terme.</strong></span></span></strong></span></p> <p> </p> <p> </p> <p><span style="color: #0000ff;"><strong>a<sub>#i_1</sub> = #t_1 està a #k diferències de a<sub>1</sub>; per a trobar a<sub>1</sub> cal fer: #t_1 <span style="font-size: medium;">-</span> #k · d.</strong></span></p> <p> </p> <p> </p> <p> </p> <p><span style="color: #0000ff;"><strong>Després es calcula la suma amb la fórmula: «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«msub mathcolor=¨#0000FF¨»«mi mathvariant=¨bold¨ mathcolor=¨#0000FF¨»S«/mi»«mi mathvariant=¨bold¨»n«/mi»«/msub»«mo mathvariant=¨bold¨ mathcolor=¨#0000FF¨»=«/mo»«mfrac mathcolor=¨#0000FF¨»«mrow»«mi mathvariant=¨bold¨»n«/mi»«mo mathvariant=¨bold¨»(«/mo»«msub»«mi mathvariant=¨bold¨»a«/mi»«mn mathvariant=¨bold¨»1«/mn»«/msub»«mo mathvariant=¨bold¨»+«/mo»«msub»«mi mathvariant=¨bold¨»a«/mi»«mi mathvariant=¨bold¨»n«/mi»«/msub»«mo mathvariant=¨bold¨»)«/mo»«/mrow»«mn mathvariant=¨bold¨»2«/mn»«/mfrac»«/mstyle»«/math»</strong></span></p> <p> </p> <p><span style="color: #0000ff;"><strong>amb a<sub>1</sub> = #a_1, n = #i_3 i d = #d</strong></span></p> <p> </p>
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Thursday, 23 August 2018, 11:09 AM
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