分数简便运算:5/7×1/4+3/4×2/7 9/17×19—38/17×4 15又3/11×1/7

问题描述:

分数简便运算:5/7×1/4+3/4×2/7 9/17×19—38/17×4 15又3/11×1/7

5/7×1/4+3/4×2/7
=5/28+6/28
=11/28
9/17×19—38/17×4
=19/17x(9-8)
=19/17x1
=19/17
15又3/11×1/7
=168/11x1/7
=24/11