3/8+5/8=?; 1/7+2(2/7+3)=?; 9-(5-3/10)=?; 4/5+2-(4/5-3/5)+1/5=? вычислите

Question

3/8+5/8=?; 1/7+2(2/7+3)=?; 9-(5-3/10)=?; 4/5+2-(4/5-3/5)+1/5=? вычислите

Comments

Это дроби? /

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да

Answer 1

3/8+5/8=8/8=1; ///1/7+2(2/7+3)=1/7+4/7+6=6 5/7;/// 9-(5-3/10)=9-5+3/10=4 3/10;/// 4/5+2-(4/5-3/5)+1/5=4/5+2-4/5+3/5+1/5=2 4/5