求助一道小学四年级方程式解法! 求一道四年级题解法~
\u6c42\u4e00\u9053\u56db\u5e74\u7ea7\u65b9\u7a0b\u7b49\u4f60\u50cf\u6211\u8fd9\u4e48\u5927\u7684\u65f6\u5019\u6211\u5df2\u7ecf\u4e09\u5341\u4e94\u5c81\u4e86
\u662f"35\u5c81"\u8fd8\u662f"39\u5c81"??
\u5982\u679c\u662f"39\u5c81",\u5219\u89e3\u7b54\u5982\u4e0b:
\u8001\u5e0827\u5c81 \u3002
\u8001\u5e08\u6bd4\u5b66\u751f\u5927\u7684\u5c81\u6570\u59cb\u7ec8\u662f\u4e0d\u53d8\u7684\u3002
\u8bbe\u8001\u5e08\u6bd4\u5b66\u751f\u5927x\u5c81\uff0c\u5219\uff1a
\uff081\uff09\u3001\u5f53\u5b66\u751f3\u5c81\u7684\u65f6\u5019\uff0c\u8001\u5e08\u662f\uff083+x\uff09\u5c81\uff1b\u4f9d\u9898\u610f\uff0c\u5176\u4e2d\u5b66\u751f\u73b0\u5728\u7684\u5c81\u6570\u662f\uff083+x\uff09\u5c81\uff1b
\uff082\uff09\u3001\u5f53\u8001\u5e0839\u5c81\u7684\u65f6\u5019\uff0c\u5b66\u751f\u662f\uff0839-x\uff09\u5c81\uff1b\u4f9d\u9898\u610f\uff0c\u5176\u4e2d\u8001\u5e08\u73b0\u5728\u7684\u5c81\u6570\u662f\uff0839-x\uff09\u5c81\uff1b
\uff083\uff09\u3001\u627e\u89c4\u5f8b\uff1a\u5b66\u751f\u73b0\u5728\u7684\u5c81\u6570\u662f\uff083+x\uff09\uff1b\u8001\u5e08\u73b0\u5728\u7684\u5c81\u6570\u662f(39-x)\uff1b\u6211\u4eec\u77e5\u9053\u8001\u5e08\u6bd4\u5b66\u751f\u5927\u7684\u5c81\u6570\u59cb\u7ec8\u662f\u4e0d\u53d8\u7684\uff0c\u8001\u5e08\u59cb\u7ec8\u6bd4\u5b66\u751f\u5927x\u5c81\u3002
\uff084\uff09\u3001\u77e5\u9053\u8001\u5e08\u6bd4\u5b66\u751f\u5927x\u5c81\uff0c\u5b66\u751f\u7684\u73b0\u5728\u5c81\u6570\uff083+x\uff09\u518d\u589e\u52a0x\u5c81\uff0c\u5e94\u8be5\u5c31\u7b49\u4e8e\u8001\u5e08\u73b0\u5728\u7684\u5c81\u6570\uff0839-x\uff09\uff1b
\u5e03\u5217\u65b9\u7a0b\uff1a
\uff083+x\uff09+ x =\uff0839-x\uff09
\u89e3\u5f97\uff1ax = 12
\u5b66\u751f\u73b0\u5728\u7684\u5e74\u9f84\uff1a3+x = 3+12 = 15 (\u5c81)
\u8001\u5e08\u73b0\u5728\u7684\u5e74\u9f84\uff1a39-x = 39-12 = 27 (\u5c81)
\u6309\u540c\u6837\u7684\u6bd4\u4f8b\u6bcf\u5403\u6389\u5927\u7c7330\u5343\u514b\u5c31\u5e94\u540330*5=150\u5343\u514b\u7684\u9762\u7c89\uff0c\u8fd9\u6837\u5b83\u4eec\u540c\u65f6\u88ab\u5403\u5b8c\u3002
\u4e8b\u5b9e\u4e0a\u6bcf\u5929\u5c11\u5403\u4e8630*5-75=75 \u5343\u514b
\u5269\u4e0b\u9762\u7c89225\u5343\u514b\uff0c225/75=3\u5929 \u8fd9\u4e9b\u662f3\u5929\u5403\u5269\u4e0b\u7684\u3002
\u5927\u7c73\uff1a3\u5929*30\u5343\u514b=90\u5343\u514b=90000\u514b
\u9762\u7c89\uff1a3*75+225=450(\u5343\u514b) =450000\u514b
4x+40*2-2x=112
2x+80=112
2x=112-80
2x=32
x=32/2
x=16
希望对楼主有帮助,如满意,请采纳谢谢
化简:4x+80-2x=112
得到2x+80=112
2x=32
得到x=16
绛旓細锛20-x)/x=x/20 涓よ竟涔20x 400-20x=x²x²+20x=400 x²+20x+100=400+100 (x+10)²=500 x+10=卤10鈭5 x=-10-10鈭5锛寈=-10+10鈭5
绛旓細鐑ф帀鐨勫姞鍓╀笅鐨勫氨鏄繖鎵圭叅鐨勬婚噺浜嗭紒28+12=40锛堝惃锛夌浜岀鏂规硶鏄敤鏂圭▼锛氳涓鍏辨湁x鍚ㄧ叅銆倄-28=12 瑙e嚭鏂圭▼灏眔k浜嗐
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绛旓細20-x=4 x=20-4 x=16 娉細鍑忔暟=琚噺鏁-宸
绛旓細涓ょ鏂规硶 绗竴绉嶏細鏂圭▼ 绗簩绉嶏細鐩堜簭闂瑙f硶 瑙o細璁句竴缁剎浜 鍏紡锛12x+24=14x+10 涓鐩堜竴浜忥細锛堢泩鍔犱簭锛夐櫎浠ワ紙涓ゆ鍒嗛厤宸級12x-14x=24-10 涓や簭鎴栦袱鐩堬細锛堜簭锛堢泩锛夊噺浜忥紙鐩堬級锛夐櫎浠ワ紙涓ゆ宸級 2x=14