Question

vă rog dau coroană și inimă orice​

Answer 1

Răspuns:

1. a) 1005x241-1005×240=1005x(241-240)=1005x1=1005

b)735x37+735x63=735(37+63)=735x100=73500

c)653+653x24+653x977=653x(1+24+977)=654x1002

d)(1+2+3+...+61):102=(62x61)÷2:102=31×31÷102

e)1+3+5+...+79=(80×40)÷2=40×40

f)39+40+41+...+57=(96x19)÷2=48x19

g)5+10+15+....+130=5x(1+2+3+...+26)=5x27×26÷2=5x27x13

h)5x-5y-6=5(x-y)-6=5x12-6=60-6=54

2)a×b+a×c+a×d=a×(b+c+d)=a×28=5628

a=201

3)a+b=40 => 3a+3b=120

b+c=57 => 5b+5c=285

3a+3b+5b+5c=3a+8b+5c=285+120=405

3a+8b+5c=405

Explicație pas cu pas:

Coroana