Răspuns :
a) 3,2+ 1 = b) 7,35+ 1 +2,(3)=
32 + 1 = Aduc la acelaşi numitor! 8
10 5 735 + 1 + 23- 3 =
32+1·2 = 100 8 9
10 735·2·9+5²·9+20·2³·5² =
32+ 2 = 1800
10 13230+225+4000 =
34 1800
10 17455 =
3,4 1800
9,69(6)
c) 21 +0,25 +0,(5) = d) 0,45+2,(3)+3,(15)+5,55=
3 45+ 23- 2 +315- 3 + 555 =
7+ 25 + 5 = 100 9 99 100
100 9 9 + 21 + 312 +111 =
7+ 1+ 5 = 20 9 99 20
4 9 9·99+21·20·11+312·20+111·99 =
7·4·9+1·9+ 5·4 = 20·99
36 99(9+111)+20·3(7·11+104) =
9(7·4+1+1) = 20·99
36 99·120+60(77+104) =
9( 28+ 2) = 20·99
36 99·120+60·181 =
9·30 = 20·99
4·9 60·(2·99+181) =
30 20·99
4 60(198+181) =
7,5 20 ·99
60·379 =
20·99
3·379 =
99
379 =
11
34,(45)
e) 39 -7 = f) 31 - 4 =
15 3 18 9
13 - 7 = 31-4·2 =
5 3 18
13·3- 7·5 = 31- 8 =
15 18
39-35 = 23 =
15 18
4 = 1,2(7)
15
0,3(6)
La punctele g; h; i; k FII EXACT în semnele scrise!
32 + 1 = Aduc la acelaşi numitor! 8
10 5 735 + 1 + 23- 3 =
32+1·2 = 100 8 9
10 735·2·9+5²·9+20·2³·5² =
32+ 2 = 1800
10 13230+225+4000 =
34 1800
10 17455 =
3,4 1800
9,69(6)
c) 21 +0,25 +0,(5) = d) 0,45+2,(3)+3,(15)+5,55=
3 45+ 23- 2 +315- 3 + 555 =
7+ 25 + 5 = 100 9 99 100
100 9 9 + 21 + 312 +111 =
7+ 1+ 5 = 20 9 99 20
4 9 9·99+21·20·11+312·20+111·99 =
7·4·9+1·9+ 5·4 = 20·99
36 99(9+111)+20·3(7·11+104) =
9(7·4+1+1) = 20·99
36 99·120+60(77+104) =
9( 28+ 2) = 20·99
36 99·120+60·181 =
9·30 = 20·99
4·9 60·(2·99+181) =
30 20·99
4 60(198+181) =
7,5 20 ·99
60·379 =
20·99
3·379 =
99
379 =
11
34,(45)
e) 39 -7 = f) 31 - 4 =
15 3 18 9
13 - 7 = 31-4·2 =
5 3 18
13·3- 7·5 = 31- 8 =
15 18
39-35 = 23 =
15 18
4 = 1,2(7)
15
0,3(6)
La punctele g; h; i; k FII EXACT în semnele scrise!