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a fost răspuns

Calculeaza in doua moduri (20+4)×9 ; 4×(63+5) ; (13+25+10)×7 ; ( 56+6+28)×3

Răspuns :

(20+4)x9=  24x9=216  20x9+4x9=180+36=216   ;4x(63+5)=4x68=272   4x63+4x5=252+20=272
(20+4)×9=24×9 (13+25+10)×7=48×7 4×(63+5)=4×63+4×5
=216 =336 =252+20
(20+4)×9=20×9+4×9 (13+25+10)×7=13×7+25×7+10×7 =272
=180+36 =91+175+70
=216 =266+70 4×(63+5)=4×68
=336 =272
(56+6+28)×3=90×3 (56+6+28)×3=56×3+6×3+28×3
=270; =168+18+92
=186+92
=288

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