6.7-3.15-1.85
=6.7-(3.15+1.85)
=6.7-5
=1.7;
85*三分之一*五分之二×17分之5
=85×(1/3)×(2/5)×(5/17)
=10/3;
1428/14+24*18
=102+24×18
=102+432
=534;
如果本题有什么不明白可以追问,
6.7-3.15-1.85
=6.7-(3.15+1.85)
=6.7-5
=1.7;
85*三分之一*五分之二×17分之5
=85×(1/3)×(2/5)×(5/17)
=10/3;
1428/14+24*18
=102+24×18
=102+432
=534;
如果本题有什么不明白可以追问,