78x82的简便方法? 77x78x79的简便方法?
78➗(2x78)\u7684\u7b80\u4fbf\u65b9\u6cd5\uff1f78\u00f778\u00f72=0.5
77\u00d778\u00d779
\uff1d\uff0878-1\uff09\u00d778\u00d7\uff0878+1\uff09
\uff1d\uff0878-1\uff09\uff0878+1\uff09\u00d778
\uff1d\uff0878²-1²\uff09\u00d778
\uff1d78³-78
\uff1d474552-78
=474474
\u7528\u5e73\u65b9\u5dee\u516c\u5f0f\u8ba1\u7b97\u6bd4\u8f83\u7b80\u4fbf\u3002
解题思路:四则运算规则(按顺序计算,先算乘除后算加减,有括号先算括号,有乘方先算乘方)即脱式运算(递等式计算)需在该原则前提下进行
解题过程:
78×82
=78×80+78×2
=6240+156
=6396
扩展资料->竖式计算-计算78×82结果:先将两乘数末位对齐,然后分别使用第二个乘数,由末位起对每一位数依次乘上一个乘数,最后将所计算结果累加即为乘积,如果乘数为小数可先将其扩大相应的倍数,最后乘积在缩小相应的倍数;
解题过程:
步骤一:2×78=156
步骤二:8×78=6240
根据以上计算结果相加为6396
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78x82
=(80-2)x(80+2)
=80x80-2x2
=6400 -4
=6396
绛旓細=78脳80+78脳2 =6240+156 =6396
绛旓細鍙互浣跨敤绠渚绠楁硶锛岀敤鍒板钩鏂瑰樊鍏紡锛屽嵆78脳82=锛80-2锛壝楋紙80+2锛=80*2-2*2=6400-4=6396銆
绛旓細锛80-2锛*锛80+2锛=80*80+80*2-2*80-2*2=6400-4=6396
绛旓細鏍规嵁澶村悓灏惧悎鍗佹硶鍒78x72=5616 鎵浠78x82=6396
绛旓細78X82鐨绗旂畻鎬庝箞鍐 瑙o細閲囩敤鍒嗛厤寰嬶紝鍘熷紡=锛80-2锛墄78 =80x78-2x78 =6240-156 =6084
绛旓細78x82 =锛80-2锛墄锛80+2锛=80x80-80x2+80x2-4 =6400-4 =6396
绛旓細灏辨槸杩欐牱鍋氱殑
绛旓細鎮ㄥソ锛78脳82=6396锛屼箻娉曠珫寮忚繍绠楀涓嬪浘鎵绀恒
绛旓細78x82=6396,绔栧紡璁$畻杩囩▼濡傚浘鎵绀猴紝甯屾湜鍙互甯埌浣犮
绛旓細78x82绔栧紡璁$畻鏂规硶濡備笅鍥撅細78x82=6396 甯屾湜鑳藉甯埌浣狅紝杩樻湜閲囩撼璋㈣阿锛