415-(220-15)的简便运算
5+10+15+...+215+220\u7684\u7b80\u4fbf\u8ba1\u7b97\u3002\u62dc\u6258\u4e86\u3002\u3002\u3002\u3002\u3002\u3002\uff085+220\uff09*44/2=4950
84*49+84*76+125*16= 84*\uff0849+76\uff09+125*16=84*125+125*16
=\uff0884+16\uff09*125=100*125=12500
150*78+220*15=150*78+22*150=150*\uff0878+22\uff09=150*100=15000
=415—220+15
=430—220
=210
答题不易 望采纳
415-(220-15)
=415-220+15
=415+15-220
=430-220
=210
若满意,可以点击右上角的“采纳答案”!
先算415-220,得结果为195,再加上15,得结果210
遇到这种不好相减的题,可以先去掉括号,然后调换一下位置就容易多了,415+15-220=210
原式等于415+15-220=210
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绛旓細(299涓43)x5鍗15 =锛299+1-1-43锛墄5鍗15 =锛300-44锛墄5鍗15 =300x5-44x5鍗15 =1500-220+15 =1280+15 =1295
绛旓細鐩存帴绠楀晩锛420-40*5绛変簬420-200绛変簬220
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绛旓細鎺ㄨ崘浜2017-12-15 10:48:19 鏈浣崇瓟妗 PZ220--15鐨鎰忔濇槸棰濆畾鐢靛帇220V,棰濆畾鍔熺巼15W,涓や釜鐏殑鍔熺巼鏄竴鏍风殑,閭d箞姝e父宸ヤ綔1灏忔椂,娑堣楃殑鐢佃兘涔熸槸涓鏍风殑(A)銆 鏈洖绛旂敱鎻愰棶鑰呮帹鑽 涓炬姤| 绛旀绾犻敊 | 璇勮 49 1 xdb333 閲囩撼鐜:30% 鎿呴暱: 鏆傛湭瀹氬埗 ...
绛旓細瑙o細64脳15-锛4脳55锛=16脳4脳15-锛4脳5脳11锛=16脳锛4脳15锛-锛20脳11锛=16脳60-220 =960-220 =740