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a fost răspuns

calculeaza in doua moduri: 43×16+16×29; 51×40-32×40;145×17-17×45;270×30-270×25.

Răspuns :

Raluk81
43×16+16×29= 688+464= 1152
16(43+29)= 16×72= 1152

51×40-32×40= 2040-1280= 760
40( 51-32)= 40×19= 760

145×17-17×45= 2465-765= 1700
17(145-45)= 17×100= 1700

270×30-270×25= 8100-6750= 1350
270(30-25)= 270×5= 1350

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