Question

G
68. Desfaceți parantezele şi efectuați operaţiile:
5
a) (-33 +7,6)-(10,8-82); b) -(5² -6 12 )+ (-³²3-5)
9
3

Ex 68 vă rog

Answer 1

Răspuns:

Explicație pas cu pas:

68.

a) (-3 5/8+7,6)-(10,8-8 3/4)=(-29/8+76/10)-(108/10-35/4)=

-29/8+76/10-108/10+35/4=-29/8-32/10+35/4=(-29·5-32·4+35·10)/40=

(-145-128+350)/40=77/40                

b) -(5 4/9-6 5/12)+(-3 2/3-5/9)=-(49/9-77/12)+(-11/3-5/9)=

-49/9+77/12-11/3-5/9=-54/9+77/12-11/3=(-54·4+77·3-11·12)/36=

(-216+231-132)/36=(-348+231)/36=-117/36=-13/4