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calculeaza, grupind convenabil termeni :423+21+9+117= 635+10+15+25= 548+42+73+127= 201+436+99+64=​

Răspuns :

423 + 21 + 9 + 117 =

= (423 + 117) + (21 + 9)

= 540 + 30

= 570

548 + 42 + 73 + 127 =

= (548 + 42) + (73 + 127)

= 590 + 200

= 790

201 + 436 + 99 + 64 =​

= (201 + 99) + (436 + 64)

= 300 + 500

= 800

Explicație pas cu pas:

(423+117)+(21+9)=540+30=570

(548+42)+(127+73)=590+200=790

(201+99)+(436+64)=300+500=800