(3 1/4 +1 1/6 : 1 5/9) : 2 2/7 + 5 1/9 : 7 2/3
помогите плиз
1) (3 1/4 + 1/1/6: 1 5/9)=13/4+7/6*9/14=13/4+21/28=91/28+21/28=112/28=4 2) 4 : 2 2/7= 4*7/16=7/4 3) 5 1/9 : 7 2/3 =46/9*3/23=2/3 4) 7/4+2/3=21/12+8/12=30/12=5/2=2,5