Matematică
enciclopedie1998
2018-01-22 14:18:12
calculeaza a) 7×3+3×9= 6×4+4×8= 7×3+3×3= 8×5-8×3= b) (8+1)×3 (7+0)×5 8×(4+4) (9-3)×7 c) 7×(9-4) (7-1)×3 5×(8-6) 7×(10-3)
Răspunsuri la întrebare
cipriana
2018-01-22 19:12:40

a) 21+27+24+32+21+9+40-32=142. b) 9x3=27 , 7x5=35 , 8x8=64 , 6x7=42. c)7x5=35 , 6x3=18 , 5x2=10 , 7x7=49

doinamunt
2018-01-22 19:13:55

a) 7×3+3×9= 3×(7+9)= 3×16= 48 21+27= 48 6×4+4×8= 4×(6+8)= 4×14= 56 24+32= 56 7×3+3×3=3×(7+3)= 3×10= 30 21+9= 30 8×5-8×3= 8×(5-3)= 8×2= 16 40-24= 16 b) (8+1)×3= 8×3+1×3= 24+3= 27 9×3= 27 (7+0)×5= 7×5+0×5= 35+0= 35 7×5= 35 8×(4+4)= 8×4+8×4= 32+32= 64 8×8= 64 (9-3)×7= 9×7-3×7= 63-21= 42 6×7= 42 c) 7×(9-4)= 7×9-7×4= 63-28= 35 7×5= 35 (7-1)×3= 7×3-1×3= 21-3= 18 6×3= 18 5×(8-6)= 5×8-5×6= 40-30= 10 5×2= 10 7×(10-3)= 7×10-7×3= 70-21= 49 7×7= 49

Adăugați un răspuns