1) 7x+ 7y/ 21 2)8m-4n/4m 3)9a+12b/3 4)45c+18d/2d 5)5x-xy/x 6)6mn-4m/2m

Question

1) 7x+ 7y/ 21 2)8m-4n/4m 3)9a+12b/3 4)45c+18d/2d 5)5x-xy/x 6)6mn-4m/2m

Answer 1

7х+7у)/21=(7(х+у))/(7*3)=(х+у)/3

(8m-4n)/8m=(4(2m-n)) /4*2m=(2m-n)/2m

(9a+12b)/3=(3(3a+4b))/3=3a+4b

(45c+18d)/27d=(9(5c+2d))/9*3d=(5c+2d)/3d

(5x-xy)/x=x(5-y)/x=5-y

(6mn-4m)/2m=(2m(3n-1))/2m=3n-1