bcd

（1）设t秒后，△APE的面积为长方形面积的13，根据题意得：AP=t，∴△APE的面积=12AP?AD=12t×4=4×63，解得：t=4，∴4秒后，△APE的面积为长方形面积的13；（2）显然当t=3时，PE⊥AB，∴△APE是直角三角形，当P在BC上时，△ADE∽△ECP，此时CPDE＝CEAD，解得：CP=94，∴PB=BC-PC=4-94=74，∴t=6+74=314；（3）①当P在AE垂直平分线上时，AP=EP，过P作PQ⊥AE于Q，∵AD=4，DE=3，∴AE=5，∴AQ=2.5，由△AQP∽△EDA，得：APAE＝AQDE，即：AP5＝2.53，解得：AP=256，∴t=256；．②当EA=EB时，AP=6，∴t=6，③当AE=AP时，∴t=5．∴当t=256、5、6时，△APE是等腰三角形．

图呢？

ad 名语,广告 add 动词，增加 abaca 名词，[植物]马尼拉麻, 麻蕉 be 动词, 是,在,存在 bad 形容词,坏的, beef 名词, 牛肉 bead 名词，珠子 bed 名词,床 bee 名词，蜜蜂 baa 名词，咩（羊叫声） babe 名词，婴儿 cab 名词，驾驶室 cad 名词，下流男子 cafe 名词，咖啡馆 caff 名词，茶馆, 小餐馆 dad 名词，爸爸 deb 名词，初次在上流社会的社交场合露面的少女 dead 形容词，死的 deaf 形容词，聋的 deface 动词，损坏 eff 动词，走开，滚开 efface 动词，抹掉，擦去 fab 形容词，极好的 face 名词，面 fad 名词，流行的时尚 fade 动词，褪色 feed 动词，喂养

AAD:Adjusts two unpacked BCD digits (the least-significant digit in the AL register and the most-significant digit in the AH register) so that a division operation performed on the result will yield a correct unpacked BCD value. The AAD instruction is only useful when it precedes a DIV instruction that divides (binary division) the adjusted value in the AX register by an unpacked BCD valueThe AAD instruction sets the value in the AL register to (AL + (10 * AH)), and then clears the AH register to 00H. The value in the AX register is then equal to the binary equivalent of the original unpacked two-digit (base 10) number in registers AH and AL.The generalized version of this instruction allows adjustment of two unpacked digits of any number base (see the 揙peration?section below), by setting the imm8 byte to the selected number base (for example, 08H for octal, 0AH for decimal, or 0CH for base 12 numbers). The AAD mnemonic is interpreted by all assemblers to mean adjust ASCII (base 10) values. To adjust values in another number base, the instruction must be hand coded in machine code (D5 imm8).AAM:Adjusts the result of the multiplication of two unpacked BCD values to create a pair of unpacked (base 10) BCD values. The AX register is the implied source and destination operand for this instruction. The AAM instruction is only useful when it follows an MUL instruction that multiplies (binary multiplication) two unpacked BCD values and stores a word result in the AX register. The AAM instruction then adjusts the contents of the AX register to contain the correct 2-digit unpacked (base 10) BCD result. The generalized version of this instruction allows adjustment of the contents of the AX to create two unpacked digits of any number base (see the 揙peration?section below). Here, the imm8 byte is set to the selected number base (for example, 08H for octal, 0AH for decimal, or 0CH for base 12 numbers). The AAM mnemonic is interpreted by all assemblers to mean adjust to ASCII (base 10) values. To adjust to values in another number base, the instruction must be hand coded in machine code (D4 imm8).

都注解到这程度了，帮不了你 - -、大致思路就是将BCD码放在SI里，转译好放到DI里。每次循环，从SI读出一个BCD码，处理后，放进DI。