5/6 + 6/7 + 4/6 + 6/7
=(5/6+4/6)+(6/7+6/7)
=9/6+12/7
=63/42+72/42
=135/42;
3/4 -(3/4-2/3)
=3/4-3/4+2/3
=2/3;
10-4/5 - 1/5 +5
=10+5-(4/5+1/5)
=15-1
=14;
13/14+5/8+3/8+1/14
=(13/14+1/14)+(5/8+3/8)
=1+1
=2;
很高兴为您解答,skyhunter002为您答疑解惑
如果本题有什么不明白可以追问,
5/6 + 6/7 + 4/6 + 6/7
=(5/6+4/6)+(6/7+6/7)
=9/6+12/7
=63/42+72/42
=135/42;
3/4 -(3/4-2/3)
=3/4-3/4+2/3
=2/3;
10-4/5 - 1/5 +5
=10+5-(4/5+1/5)
=15-1
=14;
13/14+5/8+3/8+1/14
=(13/14+1/14)+(5/8+3/8)
=1+1
=2;
很高兴为您解答,skyhunter002为您答疑解惑
如果本题有什么不明白可以追问,