d) 0,8 : { 0,2 - 7. [ 1/6 + (5/21 - 5/14)]} = ……………………………
Giải thích
d) 0,8:0,2−7 . 16+521−514 = 45:15−7 . 16+1042−1542=45:15−7 . 16+− 542
=45:15−7 . 742+− 542=45:15−7 . 121=45:15− 13=45:315− 515=45:− 215=45 . − 152=−6.
d) 0,8:0,2−7 . 16+521−514 = 45:15−7 . 16+1042−1542=45:15−7 . 16+− 542
=45:15−7 . 742+− 542=45:15−7 . 121=45:15− 13=45:315− 515=45:− 215=45 . − 152=−6.