12.5-x=6.9解方程怎么解？ 解方程：12.5-5%x=
(12-5.5)x=6.5\u89e3\u65b9\u7a0b\u600e\u4e48\u89e3\uff1f\u89e3\u9898\u6b65\u9aa4:
(12-5.5)x=6.5
6.5x=6.5
x=1
\u62d3\u5c55\u52a0\u5f3a:
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\uff081\uff0912.5-5%x=7.5\uff0c 12.5-5%x+5%x=7.5+5%x\uff0c 12.5=7.5+5%x\uff0c 12.5-7.5=7.5+5%x-7.5\uff0c 5%x=5\uff0c 5%x\u00f75%=5\u00f75%\uff0c x=100\uff1b\uff082\uff09x-23%x=15.4 77%x=15.4\uff0c 77%x\u00f777%=15.4\u00f777%\uff0c x=20\uff1b\uff083\uff09x4+12.5%x=150\uff0c 0.375x=150\uff0c 0.375x\u00f70.375=150\u00f70.375\uff0c x=400\uff1b\uff084\uff0918\uff1ax=23\uff0c 2x=54\uff0c 2x\u00f72=54\u00f72\uff0c x=27\uff1b\uff085\uff099x=90%\uff0c 90%x=9\uff0c90%x\u00f790%=9\u00f790%\uff0c x=10\uff1b\uff086\uff0924\u00d740%-3x=2.1\uff0c 9.6-3x=2.1\uff0c 9.6-3x+3x=2.1+3x\uff0c 9.6=2.1+3x\uff0c 9.6-2.1=2.1+3x-2.1\uff0c 3x=7.5\uff0c 3x\u00f73=7.5\u00f73\uff0c x=2.5\uff0e
12.5-x=6.9一、根据减法各部分之间的关系解方程
12.5-x=6.9
解：x=12.5-6.9 ——减数=被减数-差
x=5.6
二、根据等式的性质解方程
12.5-x=6.9
解：12.5-x+x=6.9+x
12.5=6.9+x
12.5-6.9=6.9+x-6.9
5.6=x
x=5.6
移项：一x=6.9一12.5
合并同类项：一x=—5.6
未知数系数化一：x=5.6
希望对你有帮助，请采纳
12.5-x=6.9
解：移项，得：
-x=6.9-12.5
合并同类项，得：
-x=-5.6
系数数化为1，得：
x=5.6。
x右移，6.9左移，交换位置
x=12.5－6.9
x=5.6
解析：依题意可得，
12.5-x＝6.9，
x＝12.5-6.9，
x＝5.6
绛旓細12.5-x=6.9 瑙ｏ細x=12.5-6.9 鈥斺斿噺鏁=琚噺鏁-宸 x=5.6 浜屻佹牴鎹瓑寮忕殑鎬ц川瑙ｆ柟绋 12.5-x=6.9 瑙ｏ細12.5-x+x=6.9+x 12.5=6.9+x 12.5-6.9=6.9+x-6.9 5.6=x x=5.6
绛旓細6.5+X=12.5 瑙ｏ細x=12.5-6.5 x=6
绛旓細浣犲ソ锛12.5-X=6.39瑙ｆ柟绋:12.5-X=6.39 12.5-6.39锛漍 X=12.5-6.39 X=6.11 甯屾湜甯姪鍒颁綘锛屾弧鎰忚閲囩撼锛岃阿璋
绛旓細5.92 - x = 0锛寈 = 5.92锛
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绛旓細鏍规嵁鍑忔暟绛変簬琚噺鏁板噺鍘诲樊锛瑙ｆ柟绋锛12.5-X=2.8 X=12.8鈥2.8 X=10
绛旓細鍏蜂綋瑙ｉ姝ラ濡備笅锛氳В锛12.5-x=2.5 绉婚」锛屽緱锛-x=2.5-12.5 鍚堝苟鍚岀被椤癸紝寰楋細-x=-10 鎶婄郴鏁板寲鎴1锛屽緱锛歺=10 妫楠 灏唜=10浠ｅ叆鍘鏂圭▼锛屽緱:宸﹁竟 12.5-10=2.5 宸﹁竟=鍙宠竟 鎵浠ワ紝x=10鏄師鏂圭▼鐨勮В銆傞檮锛氫竴鍏冧竴娆℃柟绋嬬殑鍩烘湰瑙ｆ硶 1. 绉婚」锛氭妸鏂圭▼涓惈鏈夋湭鐭ユ暟鐨勯」鍏ㄩ儴閮界Щ鍒版柟绋嬬殑鍙﹀...
绛旓細12.5涓x=12.5瑙ｆ柟绋 瑙ｏ細鍘熸柟绋嬪嵆锛歺=12.5-12.5 x=0 鎶妜=0浠ｅ叆鍘熸柟绋嬫楠岋紝12.5-0 =12.5
