7⼀9÷(11⼀5)+2⼀9×5⼀11………………0.75x65+3⼀4x34+百分之75

2025-04-13 17:34:29
推荐回答(1个)
回答1:

5/7×3/7+2/7×5/7=15/49+10/49=25/49 3×4×(1/3+1/4)=12×7/12=7 7/9×1/4+2/9÷4=7/36+(2/9)×(1/4)=7/36+2/36=9/36=1/4 15/11×0.125-4/11÷8=(15/11)×(1/8)-(4/11)×(1/8)=15/88-4/88=11/88=1/8 3/10×6/7÷3/10×6/7=(18/70)×(70/18)=1 11÷(1/5+1/6)=11÷(11/30)=11×(30/11)=30