1.
dintr o scoala pleaca la un spectacol 96 de elevi.Transportul se face cu 3 autobuze.Afla cati elevi merg intr un autobuz?
2.Afla perimetrul unui dreptunghi stiind ca latimea este de 153m.iar lungimea este triplul ei.
3.calculeaza descompunand convenabil numarulde doua sau trei cifre
a)72×2
86×5
b)99×4
57×9
c)128×6
459×9
d)888×8
603×7
DAU COROANA

1. 96/3=32 eleve in fiecare autobuz
2. lungimea=153*3=459
perimetru=2*(l+L)=1224m
3. dupa primu sau al doilea model
a) 72x2=(36+36)x2=144
Sau 72x2=72+72=144

Answer Link

Cocirmariadenis Cocirmariadenis · Answer 2 · 2018-05-27T13:12:43+03:00

1) 96 : 3 = 32 elevi merg intr-un autobuz

2) latimea = 153 m, L = 3 × 153 m = 459 m
Perimetrul dreptunghiului = 2 × L + 2 × latimea = 2 × 459 m + 2 × 153 m =
= 918 m + 306 m = 1 224 m

3)
a) 72 × 2 = ( 70 + 2) × 2 = 70 × 2 + 2 × 2 = 140 + 4 = 144
86 × 5 = ( 80 + 6 ) × 5 = 80 × 5 + 6 × 5 = 400 + 30 = 430

b ) 99 × 4 = ( 100 - 1 ) × 4 = 100 × 4 - 1 × 4 = 400 - 4 = 396
57 × 9 = ( 60 - 3) × 9 = 60 × 9 - 3 × 9 = 540 - 27 = 513

c) 128 × 6 = ( 100 + 20 + 8) × 6 = 100 × 6 + 20 × 6 + 8 × 6 =
= 600 + 120 + 48 =
= 768

459 × 9 = ( 400 + 50 + 9) = 400 × 9 + 50 × 9 + 9 × 9 =
= 3 600 + 450 + 81 =
= 4 050 + 81 =
= 4 131

d) 888 × 8 = ( 800 + 80 + 8 ) × 8 = 800 × 8 + 80 × 8 + 8 × 8 =
= 6 400 + 640 + 64 =
= 7 040 + 64 =
= 7 104

sau: ( 900 - 12) × 8 = 900 × 8 - 12 × 8 = 7 200 - 96 = 7 104

603 × 7 = ( 600 + 3 ) × 7 = 600 × 7 + 3 × 7 = 4 200 + 21 = 4 221