1Â¥:Ã×ÀÏÊó
2/7x3/5+5/7x3/5=(2/7+5/7)x(3/5)=3/5
2Â¥:ÈËÖоý×ÓÈËÈçÁú
2/7x3/5+5/7x3/5=(2/7+5/7)x(3/5)=(3/5)Íû²ÉÄÉ
3Â¥:Äã΢΢Ц×Åؼ
µÈÓÚСѧÉú,²»ºÃºÃÉÏѧ
2/7¡Á3/8+5/7¼ò±ãÔËËã
4Â¥:ÄäÃûÓû§
=2/7*3/8+5/7*8/8
=2*3/7*8+5*8/7*8
=6/56+40/56
=46/56=23/28
5Â¥:ÕÅzqÇÛ
2/7x3/8+5/7
=(1/7)x(2x3/8+5)
=(1/7)x(6/8+40/8)
=(1/7)x46/8
=46/56
=23/28
Óüò±ã·½·¨¼ÆËã5/7¡Á8+5/7¡Á3-5/7
6Â¥:ÎÒÊÇÒ»¸öÂé¹Ï°¡
5/7¡Á8+5/7¡Á3-5/7
=5/7¡Á8+5/7¡Á3-5/7¡Á1
=5/7¡Á(8+3-1)
=5/7¡Á10
=50/7
7Â¥:¹¨³ÉËØ
5/7x8+5/7x3¡ª5/7
=(5/7)x(8+3¡ª1)
=(5/7)x10
=50/7
=7ÓÖ1/7
8Â¥:ÕÅzqÇÛ
5/7x8+5/7x3¡ª5/7
=5/7x(8+3¡ª1)
=5/7x10
=50/7
9Â¥:ÌìÌÃÖ©Öë
=5/7*(8+3-1)
=(5/7)*10
=50/7
10Â¥:ÄäÃûÓû§
5/7¡Á8+5/7¡Á3-5/7
=5/7x8+5/7x3-5/7x1
=5/7x(8+3-1)
=5/7x10
=50/7
11Â¥:ÄäÃûÓû§
5/7¡Á8+5/7¡Á3-5/7=5/7¡Á8+5/7¡Á3-5/7¡Á1=5/7¡Á(8+3-1)=5/7¡Á10=50/7 ×¢:(/=·ÖÊýÏß)
12Â¥:ÄäÃûÓû§
¡¶¾«¡·Ôʽ=(8+3-1)¡Á5/7=10¡Á5/7=50/7¡¶Èñ¡·
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