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Efectueaza produsul unui factor cu o suma. A) 3x(3+2) = 3x5= .... 4x(6+3), 5x(5+1), 6x(7+2) 2x(3+5), 3x(4+3) 8x(5+4) B) 6x(4+3) = (6x 4) +(6x 3 =.... =....+...=... 7x(2+8), 8x(4+5) 9x(5+3), 6x(2+6), 5x(2+5), 4x(2+8), 10x(4+3), 7x(4+5), 6x(3+7)

Răspuns :

Alifiepefelie
4×(6+3)=4×9=36
5×(5+1)=5×6=360
6×(7+2)=6×9=54
2×(3+5)=2×8=16
3×(4+3)=3×7=21
8×(5+4)=8×9=72

b)6×(4+3)=(6×4)+(6×3)=24+18=42
7×(2+8)=(7×2)+(7×8)=14+56=70
8×(4+5)=(8×4)+(8×5)=32+40=72
9×(5+3)=(9×5)+(9×3)=45+27=72
6×(2+6)=(6×2)+(6×6=12+36=48
5×(2+5)=(5×2)+(5×5)=10+25=35
4×(2+8)=(4×2)+(4×8)=16+32=48
10×(4+3)=(10×4)+(10×3)=40+30=70 
7×(4+5)=(7×4)+(7×5)=28+35=63
6×(3+7)=(6×3)+(6×7)=18+42=60

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