(17⼀20 14.9)×[(-2⼀7)-1又3⼀7]÷21⼀56

2024-12-19 02:27:08
推荐回答(1个)
回答1:

(17/20+ 14.9)×[(-2/7)-1又3/7]÷21/56
=(0.85+14.9)x(-12/7)x56/21
= -15.75x 224/49
= -63/4x224/49
=-504/7