数学计算题！要用运算律！求过程！急急急学霸快来！
\u6570\u5b66\u8ba1\u7b97\u9898\u5b66\u9738\u5b66\u9738x^4(x-2y)+x^2(2y-x)
=x^2(x-2y)(x^2-1)=x^2(2y-x)(x-1)(x+1)
(2)=-2+2+3-3+1-4=-3
(3)=1+1/3-1/2-1/6=4/3-2/3
=2/3
(4)=3-2+3-8+1/4+3/4-2/5-3/5
=-4+1-1
=-4
(5)=10+2-8-1=3
(6)=5+3+9-4-6-7=17-17=0
(7)=1.2+0.8+3.5-0.8-0.7-2.1
=5.5-3.6
=1.9
(8)=1/2-1/2-1/3-2/3-4/5
=-1-4/5
=-9/5
绛旓細1銆佸姞娉曚氦鎹寰锛氫袱涓姞鏁颁氦鎹綅缃紝鍜屼笉鍙樸傝繖鍙仛鍔犳硶浜ゆ崲寰嬨傜敤瀛楁瘝琛ㄧず锛歛+b=b+a 2銆佸姞娉曠粨鍚堝緥锛氫笁涓暟鐩稿姞锛屽厛鎶婂墠涓や釜鏁扮浉鍔狅紝鎴栬呭厛鎶婂悗涓や釜鏁扮浉鍔狅紝鍜屼笉鍙樸傝繖鍙仛鍔犳硶缁撳悎寰嬨傜敤瀛楁瘝琛ㄧず锛氾紙a+b锛+c= a +( b+c)3銆佷箻娉曚氦鎹㈠緥锛氫袱涓洜鏁颁氦鎹綅缃紝绉笉鍙樸傝繖鍙仛涔樻硶浜ゆ崲寰嬨...
绛旓細銆鏁板銆戙愬垵涓銆戞湁鐞嗘暟鍔犲噺娣峰悎杩愮畻 姹傝繃绋 璋㈣阿鍟 =1/2+(-1/2)+4/5+(-2/3)+(-1/3) =0+4/5-1 =-1/5 鍒濅腑鏈夌悊鏁板姞鍑忔贩鍚杩愮畻璇曢 鏈夌悊鏁扮殑娣峰悎杩愮畻 鏁欏鐩爣 1.杩涗竴姝ユ帉鎻℃湁鐞嗘暟鐨勮繍婕旂畻娉曞垯鍜杩愮畻寰; 2.浣垮鐢熻兘澶熺啛缁冨湴鎸夋湁鐞嗘暟杩愮畻椤哄簭杩涜娣峰悎杩愮畻; 3.娉ㄦ剰鍩瑰吇瀛︾敓鐨勮繍绠楄兘鍔. 鏁欏...
绛旓細鏍规嵁杩愮畻鐨勫畾涔夊彲浠ユ帹瀵煎嚭杩愮畻寰銆傝繍绠楀緥鏄氳繃瀵逛竴浜涚瓑寮忕殑瑙傚療銆佹瘮杈冨拰鍒嗘瀽鑰屾娊璞°佹鎷嚭鏉ョ殑杩愮畻瑙勫緥銆傝繖涓杩囩▼灞炰簬鐢卞叿浣撳埌鎶借薄銆佺敱鐗规畩鍒颁竴鑸殑褰掔撼锛屼綋鐜颁簡鍚堟儏鎺ㄧ悊鐨勫熀鏈壒鐐广備絾浠庣煡璇嗛昏緫鏉ヨ锛岃繍绠楀緥涓庣浉鍏宠繍绠楃殑瀹氫箟鏄浉浼寸浉鐢熺殑銆鏁板瀹跺湪瀹氫箟鍥涘垯杩愮畻鐨勫悓鏃跺嵆闇鑰冭檻鈥滆兘鍚︾敱瀹氫箟鍑哄彂鍚堜箮閫昏緫...
绛旓細75*27 =75*锛30-3锛 锛堟媶鎴愪袱涓暟锛=75*30-75*3 锛堜箻娉曞垎閰寰锛=2250-225 =2025 19*25 =锛20-1锛*25 锛堟媶鎴愪袱涓暟锛=20*25-1*25 锛堜箻娉曞垎閰嶅緥锛=500-25 =475
绛旓細2脳锛1+4+7锛=24 4脳锛1+7-2锛=24
绛旓細3銆佺鍙蜂竴鑷存э細鍦杩愮畻杩囩▼涓紝闇瑕佹敞鎰忕鍙风殑涓鑷存с備緥濡傦紝鍦ㄥ姞娉曞拰鍑忔硶涓紝姝ｆ暟鍜岃礋鏁伴渶瑕佹纭湴琛ㄧず锛屼互閬垮厤娣锋穯鍜岄敊璇4銆佸鏉傝〃杈惧紡绠鍖栵細瀵逛簬澶嶆潅鐨鏁板琛ㄨ揪寮忥紝浣跨敤杩愮畻寰鍏紡鍙互甯姪绠鍖栬〃杈惧紡銆備緥濡傦紝鍒╃敤涔樻硶鍒嗛厤寰嬪彲浠ュ皢澶氫釜鏁扮浉涔樼殑琛ㄨ揪寮忕畝鍖栦负鏇寸畝鍗曠殑褰㈠紡銆備絾鏄紝鍦ㄧ畝鍖栬繃绋嬩腑闇瑕佹敞鎰忕粨鏋滅殑...
绛旓細涓冧釜杩愮畻寰涓猴細1銆佸姞娉曚氦鎹㈠緥锛歛+b=b+a锛2銆佷箻娉曚氦鎹㈠緥锛歛脳b=b脳a锛3銆佸姞娉曠粨鍚堝緥锛歛+b+c=(a+b)+c=a+(b+c)锛4銆佷箻娉曠粨鍚堝緥锛(a脳b)脳c=a脳(b脳c)锛5銆佷箻娉曞垎閰嶅緥锛歛脳(b+c)=a脳b+a脳c锛6銆佸乏鍒嗛厤寰嬶細cx(a+b) = (cxa)+(cxb)锛7銆佸彸鍒嗛厤寰嬶細(a+b)xc = (...
绛旓細鍥炵瓟锛560闄や互3=59o銆59o+140=73o
绛旓細锛2+3+4+5锛塜锛1/2+1/3+1/4+1/5锛=1+2/3+2/4+2/5+3/2+1+3/4+3/5+2+4/3+1+4/5+5/2+5/3+5/4+1=6+锛2/3+4/3+5/3锛+(2/4+3/4+5/4)+(3/2+5/2)+(2/5+3/5+4/5)=6+3+2/3+2+1/2+4+1+4/5=16+2/3+1/2+4/5=16+20/30+15/30+24/...
绛旓細鎼滅储绛旀 鎴戣鎻愰棶 鏁板鏁板,璁＄畻涓嬪垪鍚勯,骞惰鍑烘瘡涓姝ヨ繍绠楁墍渚濇嵁鐨勮繍绠楁硶鍒欐垨杩愮畻寰 ...璁＄畻涓嬪垪鍚勯,骞惰鍑烘瘡涓姝ヨ繍绠楁墍渚濇嵁鐨勮繍绠楁硶鍒欐垨杩愮畻寰(1) 璐熸牴鍙5 + 鏍瑰彿4涔樻牴鍙5
