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600+280÷4-[680÷2+4×(30+12+18)]

Răspuns :

[tex]\displaystyle 600+280 \div4-[680 \div 2+4 \times (30+12+18)]= \\ =600+280 \div 4-[680 \div 2+4 \times (42+18)]= \\ =600+280 \div 4-(680 \div 2+4 \times 60)= \\ =600+280 \div 4-(340+240)= \\ =600+280 \div 4-580= \\ =600+70-580= \\ =670-580= \\ =90[/tex]