Question

1.Calculeaza dupa modelul dat:
2×178=(100+70+8)
=2×200+2×70+2×8
=200+140+16
=340+16
=356
a)3×249
b)4×128
c)5×156=​

Answer 1

Salutare!

a)

3×249=(200+40+9)

=3×200+3×40+3×9

=600+120+27

=720+27

=747

b)

4×128=(100+20+8)

=4×100+4×20+4×8

=400+80+32

=480+32

=512

c)

5×156=(100+50+6)

=5×100+5×50+5×6

=500+250+30

=750+30

780