b^2/10 ×5/b=b^2/5 ×1/b=b/5=0,2b
3x/4 ×1/x=3/4
5a/8y ×7/10=a/8y ×7/2=7a/16y
3/4a^3 ×16a^2/9=3/4a^3 ×(4a/3)^2=1/a ×4/3=4/3a=1 1/3a
18/c^4 ×c^3/24=18/c ×1/24=3/c ×1/4=3/4c
b^2/10 ×5/b=b^2/5 ×1/b=b/5=0,2b
3x/4 ×1/x=3/4
5a/8y ×7/10=a/8y ×7/2=7a/16y
3/4a^3 ×16a^2/9=3/4a^3 ×(4a/3)^2=1/a ×4/3=4/3a=1 1/3a
18/c^4 ×c^3/24=18/c ×1/24=3/c ×1/4=3/4c