已翻譯稍復(fù)雜的方程解決問題2_1

1、1? ?prea? 5-?rre reprwprw 1-?0? 4-?2?7a879 ?8cfc.ctf?淹灄a灄8 ?7淹- f8ct?a ?ctcfac8 ?tf. ?c?f7 ?7t7. ?fac8 ?ctctf. 2?cfc.c.7? 47780f淹 ?88. ?7淹- f8ct?a ?ctcfac8 ?tf. 495 ?780f淹 ?c?f7 ?7t7. ?fac8 78tf? ?780f淹 ?耀?e?a?c?f7 ?7t7. ?fac8 ?tf. 2+ 47 ?7淹- f8ct?a ?ctcfac8 ?tf. ?e：?c?f7 ?7t7. ?fac8x?0 780f淹，2x+47=

2、4952x+47-47=495 -472x=4482x2=4482x=224?iar?:?-?0 ?rpe 224ar?.3?r? ?：070灄9.8 ?rc0f. 08? ?fcac0ca7 8407淹7t 0灄9.8 08?0f ?ct071c8cfcac0ca7 ?tf. ?1.1 ?ct071c8cfcac0ca7 4?cfc.c.7? 8?1.1?f.8?f ?fcac0ca7 78tf? 07淹7t 0灄9.8 ?0f?： aw0? ar? ? ?r0r?a? x .?1.1 ?fcac0ca7 4 x8=84 4 x88=84+8 4 x=92 4x4=924 x=23.?f?:

3、?1.1 ?fcac0ca723a? aw0? ar?.4 070灄9.8 ?rc0f. 08? ?fcac0ca7 8407淹7t 0灄9.8 08?0f ?ct071c8cfcac0ca7 ?tf. ?1.1 ?ct071c8cfcac0ca7 3?cfc.c.7? 15?1.1?f.8?88 ?fcac0ca7 78tf? 07淹7t 0灄9.8 ?0f.x3x84?80?15?80?r0r? ?arepap? .?r0：08? ct0718cfcac0ca7? ?tf. ：5?： aw0? ar? ? ?r0r?a? x .?1.1 ?fcac0ca7. 3 x15=84 3x1515

4、=8415 3x=69 3x3=693 x=23. 070灄9.8 ?rc0f. 08? ?fcac0ca7 8407淹7t 0灄9.8 08?0f ?ct071c8cfcac0ca7 ?tf. ?1.1 ?ct071c8cfcac0ca7 3?cfc.c.7? 15?1.1?f.8?88 ?fcac0ca7 78tf? 07淹7t 0灄9.8 ?0f?f?:?1.1 ?fcac0ca723a? aw0? ar?.62 2x x2020180 180 ?ere 1801802020 x x = 20 = 20 ?ere 2 2x x4040400 400 ?ere 2 2x x 400= 40

5、 400= 40 ?ere 3 3x x8 825 25 ?ere 3 3x x 25= 8 25= 8 ?ere 2 2x x383886 86 ?ere 8686 2 2x x = 38 = 38 ?ere. . 1.1.?0wr?p ?w?e?p.?8cfctf?淹灄a灄8 ?c?f7 ?7t7. ?fac8 180?780f淹 ?7淹- f8ct?a ?ctcfac8 ?ctctf. 2?cfc.c.7? 20780f淹 ?88. ?7淹- f8ct?a ?ctcfac8 ?tf. x 780f淹.（2 2） r耀p ?0wa? 400r耀p r?p?r? ?ia耀 2?00? 40?

6、 ?r?。?ia耀 x x(3)?pew ?rw?r? ?0?ra耀? r? ?e 25 ?r?耀p r?p?r? ?ep? ?e ?r? 3?00? 8? ?ep?r? ?e ?r?r? ?r?耀p x.（4） a? ?p ?r?ap ?r?r? rw?er? ?rr?r?r? 86?0r0r?a?pwp?r0 38apwp?r0.?r? ?ap x x apwp?r0。73 3x x6 618182 2x x7.57.58.58.516168 8x x40404 4x x3 39 9 29292.?e?a?p ?wr?p ?e。3.?e? ?r?r? ?ear0 ae ?iew 720?w

7、 ?iaiare r?ap?w ?w?ep ?iew ae ?iew 2?00? 160?w ?aiaiare ?r?ap?w ?w?ep ?iew ae ?iew ?r? ?iaiare ?ap?w4.?w? 1428e耀 ?耀p a?ar? 5?0?i rrpr?a? i?rrr03?0?i ? ?rrr? r0耀? ?w? ?r? rrpr? ?rr?r?081.?wr?p ?e4x+13=365 8+4x=56 3x2=28 ?r?r? ?ear0 ae ?iew 720?w ?iaiare r?ap?w ?w?ep ?iew ae ?iew 2?00? 160?w ?aiaiare

8、?r?ap?w.?r? ?a?e ?p?a0 ?r? 2?00? 30?w ap?w ?e. .re0r? ?0?p? ae ?iew e?ree耀? ?0?p? ae ?iew 4?00? 8?rerw 120?w ?iaiae ap?w耀re ?e.ae ?ar? ?rer? a? ?p? ?rer? rr? ?rrp?e ?ia ?ea耀eaw ?rer? a? ?p? ?rer? rr? ?rrp?e ?p?ia 4?00? ?e 13?e ?e.2.?r?r0 ?ea?aiw ?r?p ?pa0r?rw ?0 ?。9?wr?p ?e.?e ?r0?r00? ?r0?e ?w0?=?耀

9、 ?r0?e ?r0 ?r00? ?r0 ?r? ?w0? = =?耀 ?r0?r0w ?0?w ?rwr?ararp?er? ?r0 ?p x x ?r? ?rr?r?r? ?r?r0?r? a?aiw ?e0ar? ?er?p ?pa0r?rw wr?p?p ?p.?a?ep ?rai? ?e10?areep ?0r0w?wr? ?wrw耀? ?0r?r?+?pr? ?wrw耀? ?0r?r?=?wrw耀? rww耀0(?wr? eee ?0r?r? +?pr? eee ?0r?r?) 2= ?wrw耀? rww耀0?r?r? rwr? ?r? ?pr? a? ?a? 2?ia?耀re ?

10、pr?iap?0 a? ?wia?耀re ?0r?r? 2.8?wr?e a? 耀re ?wia? ?0r?r? 2.4?e r0耀? ?r?r? ?w? ?r? ?e ?r? ?p ?a?e112?w?10.4?erwr? ?r? ?pr? a? ?a? 2kg?wr? a? 耀re ?wia? ?r? ?e12?e：?wr? a? ?wia?耀re ?e ? ?a? ?r0r?:? ?w?e 2+2.82=10.4 2+5.6=10.4 2+5.6 5.6 =10.45.6 2=4.8 22=4.82 =2.4?wr? ?wrw耀? ?0r?r?+?pr? ?wrw耀? ?0r?r?=?w

11、rw耀? rww耀0?iar?:?wr? a? ?wia?耀re 2.4?e. 13?i?rw rw?e耀? r耀?:?ee? ? ?aw eee ?0r?r? ?0?re 2 = 2 = ?wrw耀? rww耀0 (+2.8)2=10.4(+2.8)22=10.42 +2.8=5.2? r? ?wr?p ?e ?wrwrp.?iar?:?wr? a? ?wia?耀re 2.4?e. +2.82.8=5.22.8 =2.4 14 2x2.83=13.2 2x8.4=13.22x8.48.4=13.28.4 2x=4.8 x=2.4?iar?:?wr? a? ?wia?耀re 2.4?e?f淹f

12、 281c8 ?0c? f9f ? 381c8 ?0c? ?1淹a7t ?c1?ca?. ?13.2?灄r ?cta1淹a7t?fc8a 07? ?ctc9?0c?81c8 ?ctc.f?f 2.8?灄r ?8c1t78c ?7i1c0? f.8 ?f9ctc? 07? 81c8 ?9?0c? 78tf? ?灄r ?(79c1?7a ?灄?灄a ?ca?r)?wr? ?wrw耀? ?0r?r?+?pr? ?wrw耀? ?0r?r?=?wrw耀? rww耀0?e：?wr? a? ?wia?耀re ?e ? ?a? ?r0r?:15 ?ep a? ?rr耀? aw?p ?耀e ?rr?r?r? 3

13、57 a?ap?w耀re ?p ?e耀? ?ep rr耀e ?r ?耀?r? rpp?ia a? rp0r? ?e耀? ? rr耀e ?r ?ee? ?e耀? a? aa? ?iar? rr耀e ? 3?pp?r0 ?e?e iar? ?p?r?iar? iarpp耀?e耀? ?r0? ?r? ap?r0 79ap?w耀re ?rr?rw r0耀? ?r0pr iarpp耀?e耀? ?r0? ?r? ap?r0 ?r? 耀re ap?w ?rr?rw?r? ?： rp0r? iarpp耀?e耀? ?r0? ?r? ap?r0 x 耀re ap?w ?rr?rw ? ?a? ?r0r?79 3

14、+ 3x = 357 237 + 3x = 3573x = 120x = 40?iar?:rp0r? iarpp耀?e耀? ?r0? ?r? ap?r0 40 耀re ap?w ?rr?rw 。? ?357?pp?r0a?79ap?w耀re pp?r0a? ap?w耀re ?p ?e耀?rp0r? ?e耀?(79 +x) 3= 357 2373x237 = 357237?e耀?:i?r?iar? r0耀? p? ?e耀? ?rr?rw rr0?r0rw rp0r? ?e耀? ?rr?rw ?0?r0rw ?e?r?耀? ?r0rw aw? ?p16?e?a?p ?wr?p ?0w?e5+ 1.

15、55 = 17.5(3 ) 2 = 8.5wr?p ?p ?w? ?wr?p ?e1. ? 4?00? ?r? 18? ?0waer? 36?r ?r0 ?p 2. 32.5?p a? ?r0 8?00? ?e?rrr? rwaer? 0.5r0耀? ?r ?r0 ?p.17?1.?ee? r?rw ?r?耀? rpp?ia ?rar? 237ap?w耀re ?rr耀? ?ee? ?ppe? a? a?a? ?iar? rr耀e ?3?pp?r0 ?e?e iar? a?p?iar? r?rw ap?r0 38ap?w耀re r0?rw e? a? r?rw ap?r0 ?r? 耀re ap?w ?r?rw2 2. ? ?rp0r? 72ap?w ?a ?r?ap?0 20ar? a?耀 ?wee ?a 16 ar? ar? ?wee a?pep a? ar? a?耀 awee2.4ap?w ?a ?arpr? r0耀? ?a a