三道简单的数学题，要列算式解答。 三道数学题 列算式
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\u751f1:205\uff0d116
=205\uff0d100\uff0d16
=105\uff0d16
=89
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\u5e0c\u671b\u6211\u80fd\u5e2e\u52a9\u4f60\u89e3\u7591\u91ca\u60d1\u3002
15.5-9\u53c810\u5206\u4e4b1+0.15
=15.5-9.1+0.15
=6.4+0.15
=6.55
9\u53c86\u5206\u4e4b1+4.25+6.5
=9\u53c81/6+4\u53c81/4+6\u53c81/2
=9\u53c82/12+4\u53c83/12+6\u53c86/12
=13\u53c85/12+6\u53c86/12
=19\u53c811/12
2.5+7.05-6\u53c820\u5206\u4e4b9
=2.5+7.05-6.45
=9.55-6.45
=3.1
答：去年共收小麦2700千克
第2题，12.5÷0.8=3.125元
答：小红买这两本书共便宜了3.125元
第3题，4500*0.9=4050元
4050-200×4=3250元
答：林老师只需3250元就可以买回家
1、540÷20%=2700千克
2、12.5÷80%-12.5=3.125元
3、4500×90%=4050元
4050-200×4=3250元
1，540/0.2
2,12.5/0.8
3,4500x0.9-(200x4500x0.9/1000)
1.540÷20%=2700
2.12.5/80%-12.5=3.125
3.4500*90%-4*200=3250
绛旓細绗1棰橈紝540梅20%=2700鍗冨厠 绛旓細鍘诲勾鍏辨敹灏忛害2700鍗冨厠 绗2棰橈紝12.5梅0.8=3.125鍏 绛旓細灏忕孩涔拌繖涓ゆ湰涔﹀叡渚垮疁浜3.125鍏 绗3棰橈紝4500*0.9=4050鍏 4050-200脳4=3250鍏 绛旓細鏋楄佸笀鍙渶3250鍏冨氨鍙互涔板洖瀹
绛旓細1銆佷袱杈嗘苯杞﹀悓鏃朵粠涓ゅ湴鍑哄彂鐩稿悜鑰岃锛3灏忔椂鍚庡湪绂讳腑鐐15鍗冪背澶勭浉閬囷紝宸茬煡蹇溅姣忓皬鏃惰88鍗冪背锛屾眰鎱㈣溅鐨勯熷害銆傝В锛氳鎱㈣溅閫熷害涓烘瘡灏忔椂x鍗冪背 3(88-x)=15脳2 3(88-x)=30 88-x=10 x=88-10 x=78 绛旓細鎱㈣溅閫熷害涓烘瘡灏忔椂78鍗冪背銆2銆佺敳銆佷箼涓よ締姹借溅浠嶢銆丅涓ゅ湴鍚屾椂鐩稿悜寮鍑猴紝鍑哄彂鍚2灏忔椂锛屼袱...
绛旓細1. 杩欎釜鐩掑瓙鐨勯暱瀹介珮鍒嗗埆鏄細30-5-5銆25-5-5銆5锛屾墍浠ヤ綋绉=20*15*5=1500绔嬫柟鍘樼背 2. 鍑忓皯鐨勮〃闈㈢Н瀹為檯灏辨槸杩5鍘樼背鐨勫洓涓晶闈㈢殑闈㈢Н鍜岋紝鑰屼笖杩欏洓涓晶闈㈡槸涓鏍风殑锛屾墍浠60/4/5=3璇存槑姝ｆ柟浣撹竟闀夸负3锛鍘熸潵闀挎柟浣撶殑闀夸负3+5=8锛屽鍜岄珮閮芥槸3锛屼綋绉=8*3*3=72绔嬫柟鍘樼背 3. 琛ㄩ潰绉-2鍊嶇殑...
绛旓細3瑙(a+b)^2=a^2+b^2+2ab=7 (a-b)^2=a^2+b^2-2ab=3 涓ゅ紡鐩稿噺寰4ab=4 瑙ｅ緱ab=1 4 a^(2x-y)=a^(2x)脳a^(-y)=(a^x)^2/a^y =2^2/3 =4/3 5鐢眡=2y 浠ｅ叆x+4=y 鍗2y+4=y 瑙=-4 鏁厁=-8 鏁卆=x-y/2=-8-(-4)/2=-6 ...
绛旓細闂涓锛歏姘=S姘*h姘 =30*20*15 =9000绔嬫柟鍘樼背 V姘=3/4V锛堝渾鏌憋級9000=锛3/4锛夛紙蟺*20^2锛*h锛堝渾鏌憋級h(鍦嗘煴)=30/蟺 闂浜岋細V鍦=94.2=S鍦*h姝 鍗筹細94.2=蟺*锛1/2*h姝ｏ級^2 *h姝
绛旓細1銆佸渾鏌辩殑浣撶Н锛68梅锛1+3锛壝3 =17脳3 =51绔嬫柟鍘樼背 2銆佷互鐭洿瑙掕竟涓鸿酱鏃嬭浆涓鍛紝鍙互寰楀埌涓涓渾閿ヤ綋 鍦嗛敟鐨勪綋绉細3.14脳4鐨勫钩鏂姑3脳1/3 =3.14脳16 =50.24绔嬫柟鍘樼背 3銆佹按姹犲绉細4脳4脳2=32绔嬫柟绫 娴佹按妯埅闈㈢Н锛3.14脳锛10梅2锛夌殑骞虫柟=78.5骞虫柟鍘樼背=0.00785骞虫柟绫 鏃堕棿锛32...
绛旓細1銆佽鍓笅鐨勪竴娈典负x鍒嗙背锛24-x=锛30-x锛5/8 24-x=30*5/8-5/8x 绉婚」锛寈绉诲埌鍙宠竟锛屾暟鍊肩Щ鍒板乏杈广24-30*5/8=x-5/8x 瑙ｅ緱x=14 2銆佸師闀縳绫筹紝X- ( 1/4X+15+( X-(1/4X+15) )2/5-4 )=40 X-(1/4*X+15+2/5*X-1/10*X-6-4 )=40 X-1/4X-15-2/5X-1/10X...
绛旓細1銆佽2鏁撮櫎锛1000梅2=500涓 琚3鏁撮櫎锛999梅3=333涓 鍏辨湁500+333=833涓 2銆佸彟鍘熷垎鏁皒/y (x+2锛/y=3/10锛屽嵆10x+20=3y x/(y-2)=1/4锛屽嵆4x=y-2 瑙ｅ嚭x=7锛寉=30 杩欎釜鍒嗘暟涓7/30 3銆1001=7*11*13 鎵浠ヨ繖涓変釜璐ㄦ暟鍒嗗埆涓7銆11銆13 鍗1/7+1/11+1/13=311/1001 ...
绛旓細瑙ｏ細1.)璁惧叡鑲夐浮X鍙 銆(1-40%X)*(1-1/3)銆=1200 瑙ｅ緱X=3000 绛:鍏辫倝楦3000鍙.2.)12-12*(5/9)=16/3(鍚)绛:杩樺墿16/3鍚 3.)36400/(36400+3900)鈮0.90 鍗90 鎵浠ヨ秴浜1-90%=10 绛:瓒呬骇绾10
绛旓細3. 涓涓垎鏁帮紝鍒嗗瓙涓庡垎姣嶄箣鍜屾槸100锛屽鏋滄妸鍒嗗瓙鍔23锛屽垎姣嶅姞32锛屾柊鐨勫垎鏁扮害鍒嗗悗鏄2/3锛鍘熸潵鐨勫垎鏁版槸澶氬皯锛熻В锛氳鍘熸潵鐨勫垎鏁板垎瀛愭槸x锛屽垎姣嶆槸y锛寈銆亂閮芥槸鏁存暟锛屽垯 x+y=100 鈶 锛坸+23锛/锛坹+32锛=2/3 鈶 鐢扁憽寰 3锛坸+23锛=2锛坹+32锛3x+69=2y+64 3x-2y=-5 鈶 鐢扁憼寰...
