Question

va rog ajutati-ma dau coronita​

Answer 1

1. A: a) a•b= 477

b) a•b= 224

c) a•b= 567

d) a•b= 430

e) a•b= 320

f) a•b= 195

B: a) a•b= 441

b) a•b= 608

2. a) (32+45)•7= 77•7= 539

Sau (32+45)•7=32•7+45•7=224+315= 539

b) 7•(45+28)= 7•73= 511

Sau 7•(45+28)= 7•45+7•28= 511

c) (87+13)•5= 5•100= 500

Sau (87+13)•5= 5•87+5•13= 500

d) 9•(36+43)= 9•79= 711

Sau: 9•(36+43)= 9•36+9•43= 711

3. a) 43•7+49•9= 301+441= 742

b) 97•7-(97-7)= 679-90= 589

c) 360-x= 80•3

360-x= 240=> x= 360-240

x= 120

4. a+b+c= 657

a= 84

b= 84•4=> b= 336

-> c= 657-84-336

= 237