U R G E N T!!! Verificati daca am facut corect si completati fisa, dau coroana
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Răspuns
Explicație pas cu pas:
4)
457 684 > 457 574
394 287 < 394 683
754 384 = 754 384
157 354 < 168 932
482 986 < 483 896
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5) a) ordinul miilor
7 019 7 123 7 019 → numere > 7 000
7 000
6 548 6 724 6 912 → numere mai mici decat 7 000
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b) rotunjite la zeci de mii
62 318 61 289 64 349
60 000
58 726 59 123 57 984
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c) sutelor de mii
312 768 324 567 345 678
300 000
278 567 287 569 298 145
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6) X; L; V; I ⇔ I, V, IV, VI, IX, X, XI, XIV, XV, XVI, L, LI, LV, LIV, LVI, XL, XLI, XLV, XLIV, XLVI, LX, LXI, LXIV, LXV, LXVI
b) D; C; X ⇒ X; XC; CX; CD; D; DX; DC; DCX
c) M; D; C ⇔ C; D; CD; DC; MC; M; CM; MD; MCD; MDC
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1) Ordinea efectuarii operatiilor
a) 294 864 + 293 663 + 292 462 + 5 136 + 6 337 + 7 538 =900 000
= ( 294 864 + 5 136 ) + ( 293 663 + 6 337 ) + ( 292 462 + 7 538 ) =
→ aplic asociativitatea adunarii
= 300 000 + 300 000 + 300 000 =
= 900 000
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b) 386 × 99 - 386 × ( 100 - 1 ) = 0
dau factor comun pe 386
= 386 × ( 99 - 99 ) =
= 386 × 0 =
= 0
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c) 2 485 × 999 =
= 2 485 × ( 1 000 - 1 ) =
= 2 485 × 1000 - 2 485 × 1 =
= 2 485 000 - 2 485 =
= 2 482 515
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d) 4 × 825 + 4 × 157 + 4 × 1 018 = 8 000
= 4 × ( 825 + 157 + 1 018 ) =
= 4 × 2 000 =
= 8 000
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e)
5 496 : 12 + 5 352 : 12 = 904
= ( 5 496 + 5 352 ) : 12 =
= 10 848 : 12 =
= 904
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2)
a) 436 × 27 - 2 088 : 36 = 11 772 - 58 = 11 714
b)
88 × 0 + 139 × 4 - 39 : 39 = 555
= 0 + 556 - 1 =
= 556 - 1 =
= 555
c)
[ 550 : 5 - 15 : ( 35 : 7 - 28 : 7 ) ] : 5 - 5 =
= [ 110 - 15 : ( 5 - 4 ) ] : 5 - 5 =
= ( 110 - 15 : 1 ) : 5 - 5 =
= ( 110 - 15 ) : 5 - 5 =
= 95 : 5 - 5 =
= 19 - 5 =
= 14
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3)
98 → cel mai mare numar par scris cu 2 cifre
a : 98 = 89 rest r; 90 < restul < 98, nr impar ⇒ restul = 91; 93; 95; 97
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a : 98 = 89 rest 91
a = 89 × 98 + 91
a = 8 722 + 81
a = 8 803 → deimpartitul
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a : 98 = 89 rest 93
a = 98 x 89 + 93
a = 8 722 + 83
a = 8 805
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a : 98 = 89 rest 95
a = 89 x 98 + 95
a = 8 807
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a : 98 = 89 rest 97
a = 89 x 98 + 97
a = 8 809