Đáp án:
Giải thích các bước giải:
cách 1
a)5/24 x 5/12 x 24= 25/(24x12) x 24
= 25/12
b)(1/4+2/3)x4/5=11/12 x 4/5
=11/15
c)3/7x16/33+16/33x4/7=16/77+64/231
=16/33
cách 2
a)5/24x5/12x24=(5/24 x 24) x 5/12
=5x5/12=25/12
b)(1/4+2/3)x4/5=1/4x4/5+2/3x4/5
=1/5+8/15=11/15
c)3/7x16/33+16/33x4/7=16/33x(3/7+4/7)
=16/33 x 1 = 16/33