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-21-2•{15+4•[10-(7-5)-(-3+6)]}+100=?​

Răspuns :

= -21-2×[15+4×(10-2-3)]+100

= -21-2×(15+4×5)+100

= -21-2×(15+20)+100

= -21-2×35+100

= -21-70+100

= -91+100

= 9 .