42-8=?先算()-()=?再算()-()=? 42-8=几?先算什么?再算什么?
42-8\u65f6\uff0c\u53ef\u4ee5\u5148\u7b97\uff0c\uff08\uff09-\uff08\uff09=\uff08\uff09\u518d\u7b97\uff08\uff09-\uff08\uff09=\uff08\uff0942-8\u65f6
\u53ef\u4ee5\u5148\u7b97
\uff0850\uff09-\uff088\uff09=\uff0842\uff09
\u518d\u7b97
\uff0842\uff09-\uff088\uff09=\uff0834\uff09
42-8=\u51e0?\u5148\u7b9712\u20148=4\u3002
\u518d\u7b974+30=34\u3002
42-8=?先算(42)-(2)=40 再算(40)-(6)=34
绛旓細鍋囪鍏ㄩ儴閮芥槸灏忔锛岄偅涔堝叡鐢ㄩ挶1860+30脳8=2100鍏 鎵浠ュ皬妗岀殑浠锋牸鏄細2100梅锕20+30锕=2100梅50=42鍏 灏忓嚦鐨勪环鏍兼槸42-8=34鍏
绛旓細鎸夌収棰樻剰鍙互寰楀涓嬬畻寮 [42-()]梅3=6 42-()=6脳3 ()=42-18 ()=24 姝g‘鐨勭畻寮忔槸 42−()梅3 =42-24梅3 =42-8 =34 绛旀纭殑缁撴灉鏄34
绛旓細鍏堢畻鎷彿閲岀殑锛屽啀绠楁嫭鍙峰闈㈢殑銆42-锛8-2锛=42-6 =36
绛旓細鍏堢敤涓鍑忓叓锛岄偅涓涓嶅鍑忥紝灏辫繕瑕佽礋涓冿紝鍐嶄粠浜斿崄閲岄潰鎷垮嚭涓涓崄锛屽崄鍑忎箣鍓嶈礋鐨勪竷绛変簬3鍐嶇敤鍥涘崄鍔犱笁锛屽氨绛変簬43锛堣繖绉嶉璁茶捣鏉ユ湁浜涢毦锛屾渶濂借繕鏄幓鍒楃珫寮忥級涔熷彲浠ョ敤10鍑8绛変簬浜岋紙10鏄粠浜斿崄涓閭i噷鎺ヨ繃鏉ョ殑锛夐偅浜斿崄涓鍑忓崄绛変簬41锛屽啀鍔犱箣鍓10鍑8鍓╀笅鐨勪簩锛屽氨鏄41+2绛変簬43锛堟渶濂藉幓鍒楃珫寮忥級...
绛旓細鏂规硶濡備笅锛岃浣滃弬鑰冿細
绛旓細鍑9瑕佸姞1锛屽噺8瑕佸姞2锛屽噺7瑕佸姞3锛屽噺6瑕佸姞4锛屽噺5瑕佸姞5锛屽噺4瑕佸姞6锛屽噺3瑕佸姞7锛屽噺2瑕佸姞8锛屽噺1瑕佸姞9銆傚悓鏍风殑锛屽彛璇涓殑鍑忓嚑閮芥槸鍦ㄦ寚鍑忎釜浣嶄笂鐨勬暟銆傛瘮濡42-19锛岃繖鏃讹紝灏辫杩愮敤鍒板彛璇锛屽噺9锛岀粰42涓綅鐨2锛屽姞1鍙樻垚3锛屼箣鍚庯紝鍗佷綅鍏堥涓锛屽啀鐢4閫涓鍚庯紝鍓╀笅鐨3鏉ュ噺1锛屾渶鍚庣粨鏋滅瓑浜23銆
绛旓細42-7+18鍥涘垯杩愮畻 瑙i鎬濊矾锛氬洓鍒欒繍绠楄鍒欙紙鎸夐『搴忚绠椼佸厛绠椾箻闄ゅ悗绠楀姞鍑忥紝鏈鎷彿鍏堢畻鎷彿锛屾湁涔樻柟鍏堢畻涔樻柟锛夊嵆鑴卞紡杩愮畻锛堥掔瓑寮忚绠楋級闇鍦ㄨ鍘熷垯鍓嶆彁涓嬭繘琛 瑙i杩囩▼锛42-7+18 =35+18 =53
绛旓細26+3=29 26+43=(26+3)+40=29+40=69 26+63=(26+3)+60=29+60=89銆5+38=43 25+38=20+(5+38)=20+43=63 55+38=50+(5+38)=50+43=93銆42+8=50 42+18=(42+8)+10=50+10=60 42+48=(42+8)+40=50+40=90銆19+7=26 19+37=(19+7)+30=26+30=56 19+77=(19+7)...
绛旓細鍑忔硶蹇冪畻 1銆佸噺鍑戞暣鏁板啀鍔犱笂锛氭瘮濡52锛7锛45锛岃繖鏍风畻锛氭妸鈥7鈥濆彉鎴愨10-3鈥濓紱閭d箞锛52-10+3锛45锛2銆侀敊浣嶆暟鐩稿噺 姣斿83-38锛45锛岃繖鏍风畻锛8-3锛5锛5X9锛45锛3銆佸浣嶆暟杩炵画鐩稿噺 姣斿387锛50锛42锛31锛264锛鍏堢畻瀹规槗鐨勶紝387-50锛337锛岀劧鍚庯紝鍐嶆妸42涓31鍐嶅姞寰73锛涚劧鍚庯紝337-73锛屽彲浠ュ彉鎴...
绛旓細(1)鏁存暟鍔犳硶浜ゆ崲寰嬨佺粨鍚堝緥瀵瑰皬鏁板悓鏍烽傜敤---( )(2)4.72+0.1-4.72+0.1=0 ---( )(3)璁$畻灏忔暟鍔犲噺娉,寰楁暟鐨勫皬鏁伴儴鍒嗘湁0鐨勮鎶0鍘绘帀 ---( )(4)灏忔暟鍔犲噺娉曟贩鍚堣繍绠椾竴瀹氳鍏堢畻鍔犳硶,鍚庣畻鍑忔硶---( )浜斻佽В鍐抽棶棰樸1銆佹煇澶╂棭涓婃皵娓╂槸6.5鈩,涓崍姘旀俯姣旀棭涓婂崌楂樹簡3.1鈩,鏅氫笂姣斾腑鍗堥檷浣庝簡4.5鈩,璇烽棶杩欏ぉ鏅...