42-8时,可以先算,()-()=()再算()-()=() 42-8-2先算什么再算什么
42-8=?\u5148\u7b97\uff08\uff09-\uff08\uff09=\uff1f\u518d\u7b97\uff08\uff09-\uff08\uff09=\uff1f42-8=34 \u5148\u7b972-8\uff0c\u4f46\u662f2\uff1c8\uff0c\u6240\u4ee5\u54114\u501f\u4e00\u4f4d\uff0c= 12-8=4\u518d\u7b974-1\uff08\u88ab\u501f\u53bb\u7684\u90a3\u4e2a\u6570\uff09=3\u5219 \u7ed3\u679c\u662f34
42-8-2\u5148\u7b97\uff088+2\uff1d10\uff09\uff0c\u518d\u7b97\uff0842-10\uff1d32\uff09\u3002
\u5217\u5f0f\u8ba1\u7b97\uff1a
42-8-2
=42-\uff088+2\uff09
=42-10
=32
\u6269\u5c55\u8d44\u6599
\u52a0\u6cd5\u662f\u57fa\u672c\u7684\u56db\u5219\u8fd0\u7b97\u4e4b\u4e00\uff0c\u5b83\u662f\u6307\u5c06\u4e24\u4e2a\u6216\u8005\u4e24\u4e2a\u4ee5\u4e0a\u7684\u6570\u3001\u91cf\u5408\u8d77\u6765\uff0c\u53d8\u6210\u4e00\u4e2a\u6570\u3001\u91cf\u7684\u8ba1\u7b97\u3002\u8868\u8fbe\u52a0\u6cd5\u7684\u7b26\u53f7\u4e3a\u52a0\u53f7\u201c+\u201d\u3002\u8fdb\u884c\u52a0\u6cd5\u65f6\u4ee5\u52a0\u53f7\u5c06\u5404\u9879\u8fde\u63a5\u8d77\u6765\u3002
(30)+(-4)=(26)\u3002
\u51cf\u6cd5\u662f\u56db\u5219\u8fd0\u7b97\u4e4b\u4e00\uff0c\u4ece\u4e00\u4e2a\u6570\u4e2d\u51cf\u53bb\u53e6\u4e00\u4e2a\u6570\u7684\u8fd0\u7b97\u53eb\u505a\u51cf\u6cd5\uff1b\u5df2\u77e5\u4e24\u4e2a\u52a0\u6570\u7684\u548c\u4e0e\u5176\u4e2d\u4e00\u4e2a\u52a0\u6570\uff0c\u6c42\u53e6\u4e00\u4e2a\u52a0\u6570\u7684\u8fd0\u7b97\u53eb\u505a\u51cf\u6cd5\u3002\u8868\u793a\u51cf\u6cd5\u7684\u7b26\u53f7\u662f\u201c-\u201d\uff0c\u8bfb\u4f5c\u51cf\u53f7\u3002
可以先算
(50)-(8)=(42)
再算
(42)-(8)=(34)
你好,很高兴为你解答
42-8时,可以先算,(42)-(2)=(40)再算(40)-(6)=(34)
满意采纳哦!
先算(10-8=2),再算(32+2=34)
42-8时,可以先算,(42)-(2)=(40)再算(40)-(6)=(34)
42-8时,可以先算,(42)-(10)=(32)再算(10)-(8)=(2)
42-8=32+10-8=32+2=34
绛旓細42-8鏃 鍙互鍏堢畻 锛50锛-锛8锛=锛42锛夊啀绠 锛42锛-锛8锛=锛34锛
绛旓細42-8=34 鍏堢畻2-8锛屼絾鏄2锛8锛屾墍浠ュ悜4鍊熶竴浣嶏紝= 12-8=4鍐嶇畻4-1锛堣鍊熷幓鐨勯偅涓暟锛=3鍒 缁撴灉鏄34
绛旓細鍏堢畻10鍑8寰2锛屽啀绠32鍔2寰34
绛旓細42-8=锛42-10锛+2=32+2=34 涔熷氨鏄锛屽厛绠42鍑10锛屽啀绠楀姞2灏卞緢瀹规槗绠楀嚭鏉ヤ簡銆
绛旓細绗簩绉嶆槸浠42閲屽厛鎻愬嚭10锛岀敤10-8=2锛屽湪鐢32+2=34銆傚簲鐢ㄩ鐨勮В棰樻濊矾锛氾紙1锛夋浛浠f硶鏈変簺搴旂敤棰橈紝缁欏嚭涓や釜鎴栦袱涓互涓婄殑鐨勬湭鐭ラ噺鐨勫叧绯伙紝瑕佹眰姹傝繖浜涙湭鐭ラ噺锛屾濊冪殑鏃跺欙紝鍙互鏍规嵁棰樹腑鎵缁欑殑鏉′欢锛岀敤涓涓湭鐭ラ噺浠f浛鍙︿竴涓湭鐭ラ噺锛屼娇鏁版嵁閲忓叧绯诲崟涓鍖栥備粠鑰屾壘鍒拌В棰橀斿緞銆傦紙濡傚嶆暟鍏崇郴搴旂敤棰橈級锛2锛...
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