Question

Observă exemplele de calcul rapid:
76-9 = 76 -10 + 1 = 66 + 1 = 67
56 - 11 = 56 - 10 - 1 = 46 - 1 = 45
Calculează asemănător:
A a) 46-9 b) 354 - 99 c) 5 324 - 999
d) 72-8 e) 802 - 98 f) 3 526-998
B a) 69-11 b) 321 - 101 c) 9 205 - 1001
d) 79 - 12 e) 542 - 102 f) 4712-1002



Va rog frumos dau coroana! Urgent! ​

Answer 1

Răspuns:

A a)46-9=46-10+1=36+1=37

b)354-99=354-100+1=254+1=255

c)5324-999=5324-1000+1=4324+1=4325

d)72-8=72-10+2=62+2=64

e)802-98=802-100+2=702+2=704

f)3526-998=3526-1000+2=2526+2=2528

B.a)69-11=69-10-1=59-1=58

b)321-101=321-100-1=221-1=220

c)9205-1001=9205-1000-1=8205-1=8204

d)79-12=79-10-2=69-2=67

e)542-102=542-100-2=442-2=440

f)4712-1002=4712-1000-2=3712-2=3710