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rog am de calculat 625-5x5+71x102-13x14=

(112+8)x21-(647+319)x17x(426-26-4x100)=
528x(3+10)-8x108=
721+5(5x16)-(5x4x4)=

In proiect au participat 3 scoli. In fiecare scoala sunt 27clase a cite 25 elevi. La proiect nu au participat elevii din clasele pregatitoare si intii. Stiind ca in fiecare scoala sunt doua clase pregatitoare si 3 clase intii afla citi elevi au participat (27-2-3)x25x3 ,(27-2+3)x(25x3) ,(27x25-2x25-3x25)x3


Răspuns :

625-25+7242-182= 600+7242-182=7660
(112+8)x21-(647+319)x 17x(426-26-4x100)= 120x21-328x17x(400-400)=2520-328x0=2520
528x(3+10)-8x108= 528x13-864=6864-864=6000
721+5(5x16)-(5x4x4)= 721+400-80=1041

(27-2-3)x 25x3= 22x75=1650
(27-2-3)x(25x3)= 22x75=1650
(25x25-2x25-3x25)x3= (625-50-75)X3= 500x3=1500