Question

Calculează după model:28×9+28×99+28×999=28×(9+99+999)=28×1107=30996 a.62×19+62×199+62×1999 ; 78×43+78×435+78×4035 ; b.86×496+86×354-86×529 ; 35×358-35×243+35×194

Answer 1

Salut!

a. 62 × 19 + 62 × 199 + 62 × 1999 =

62 × ( 19 + 199 + 1999 ) =

62 × 2217 =

137454

78 × 43 + 78 × 435 + 78 × 4035 =

78 × ( 43 + 435 + 4035 ) =

78 × 4513 =

352014

b. 86 × 496 + 86 × 354 - 86 × 529 =

86 × ( 496 + 354 - 529 ) =

86 × 321 =

27606

35 × 358 - 35 × 243 + 35 × 194 =

35 × ( 358 - 243 + 194 ) =

35 × 309 =

10815