thực hiện phép tính a, 17/18 – 11/6 + 2/9 b, 8/15 + -7/18 – 13/90 c, 5/12+-11/15-49/60 d, 21/28 – 18/60 + 3/5 01/11/2021 Bởi Rose thực hiện phép tính a, 17/18 – 11/6 + 2/9 b, 8/15 + -7/18 – 13/90 c, 5/12+-11/15-49/60 d, 21/28 – 18/60 + 3/5
a) 17/18-11/6+2/9 =17/18-33/18+4/18 =-12/18 b) 8/15+(-7/18)-13/90 =48/90-35/90-13/90 =0/90=0 c) 5/12+(-11/15)-49/60 =25/60-44/60-49/60 =-68 d) 21/28-18/60+3/5 =315/420-126/420+252/420 =441/420 Bình luận
a) 17/18-11/6+2/9
=17/18-33/18+4/18
=-12/18
b) 8/15+(-7/18)-13/90
=48/90-35/90-13/90
=0/90=0
c) 5/12+(-11/15)-49/60
=25/60-44/60-49/60
=-68
d) 21/28-18/60+3/5
=315/420-126/420+252/420
=441/420