Sagot :
Réponse :
Explications étape par étape
Bonjour,
13 ×1 + 20= 13+20
; 13 × 2 + 20= 26+20
; 13× 3 + 20= 10*3+3*3 + 20 =30+9+20 =50+9
; 13 × 4 + 20 =10*4 + 3*4 +20 = 40+12+20 = 60+12
13*5 +20 = 10*5+3*5 +20 = 50+15+20 = 70+15
; 13 ×6 + 20= 10*6+3*6+20 = 60+18+20= 80+18
; 13 ×7 + 20 = 10*7 + 3*7 +20 = 70+21+20 = 70+20+20+1 = 110+1
; 13 × 8 + 20 = 10*8+3*8 +20 = 80+24 +20 = 100+24
13 × 9 + 20= 10*9 +3*9 +20= 90 + 27+20 = 100+ 10+20+7 = 130+7
; 13 × 10 + 20 = 10*10 +3*10 +20 = 100+30+20= 150
; 13 ×11 + 20 = 10*11 + 3*11 +20 = 110+33+20= 110+50+3=160 +3
; 13× 12 + 20=3 = 13*10 +13*2 +20 = 130 + 26+20 = 130+40+6 = 170+6
; 13 × 13 + 20 = 13*10 +3*10+ 3*3 + 20= 130 +30 + 20 +9 = 180+9
13*14 = 13*10 + 10*4+3*4+20=130+40+12+20= 190+12
; 13 × 15 + 20 = 13*10 + 10*5 + 3*5 +20 = 130+50+15+20=
200 +15
Réponse :
Explications étape par étape
Bonsoir
Consigne: trouver une écriture plus simple :
13 ×1 + 20
= (10 + 3) x 1 + 20
= 10 x 1 + 3 x 1 + 20
= 10 + 3 + 20
= 33
13 × 2 + 20
= (10 + 3) x 2 + 20
= 10 x 2 + 3 x 2 + 20
= 20 + 6 + 20
= 46
13× 3 + 20
= (10 + 3) x 3 + 20
= 10 x 3 + 3 x 3 + 20
= 30 + 9 + 20
= 59
13 × 4 + 20
= (10 + 3) x 4 + 20
= 10 x 4 + 3 x 4 + 20
= 40 + 12 + 20
= 72
13 ×5 + 20
= (10 + 3) x 5 + 20
= 10 x 5 + 3 x 5 + 20
= 50 + 15 + 20
= 85
13 ×6 + 20
= (10 + 3) x 6 + 20
= 10 x 6 + 3 x 6 + 20
= 60 + 18 + 20
= 98
13 ×7 + 20
= (10 + 3) x 7 + 20
= 10 x 7 + 3 x 7 + 20
= 70 + 21 + 20
= 111
13 × 8 + 20
= (10 + 3) x 8 + 20
= 10 x 8 + 3 x 8 + 20
= 80 + 24 + 20
= 124
13 × 9 + 20
= (10 + 3) x 9 + 20
= 10 x 9 + 3 x 9 + 20
= 90 + 27 + 20
= 137
13 × 10 + 20
= (10 + 3) x 10 + 20
= 10 x 10 + 3 x 10 + 20
= 100 + 30 + 20
= 150
13 ×11 + 20
= (10 + 3) x (10 + 1) + 20
= 10 x 10 + 10 x 1 + 3 x 10 + 3 x 1 + 20
= 100 + 10 + 30 + 3 + 20
= 163
13× 12 + 20
= (10 + 3) x (10 + 2) + 20
= 10 x 10 + 10 x 2 + 3 x 10 + 3 x 2 + 20
= 100 + 20 + 30 + 6 + 20
= 176
13 × 13 + 20
= (10 + 3) x (10 + 3) + 20
= 10 x 10 + 10 x 3 + 3 x 10 + 3 x 3 + 20
= 100 + 30 + 30 + 9 + 20
= 189
13 × 14 + 20
= (10 + 3) x (10 + 4) + 20
= 10 x 10 + 10 x 4 + 3 x 10 + 3 x 4 + 20
= 100 + 40 + 30 + 12 + 20
= 202
13 × 15 + 20
= (10 + 3) x (10 + 5) + 20
= 10 x 10 + 10 x 5 + 3 x 10 + 3 x 5 + 20
= 100 + 50 + 30 + 15 + 20
= 215