Verified answer

№ 378

а)=1/4-1/12=1/6

б)=2-1/6=11/6=1 5/6

№ 426

а)7.3х-34.31=38.69

7.3х=38.69+34.31

7.3х=73

х=10

б)20.88-5.8а=14.5

5.8а=20.88-14.5

5.8а=6.38

а=1.1

№378    а) 1/4-(1-11/12)=1/4-1/12=3/12-1/12=2/12=1/6       б)2-(13/33-5/22)=2-(26/66-15/66)=2-11/66=1 6/6-1/6=1 15/18