Toán Tính nhanh nha mn 1/6+1/12+1/20+1/30+1/42 19/11/2021 By Liliana Tính nhanh nha mn 1/6+1/12+1/20+1/30+1/42
Đáp án: 5/14 Giải thích các bước giải: 1/6+1/12+1/20+1/30+1/42 =( 1/6 + 1/12) +(1/20 +1/30)+1/42 =(2/12+1/12)+(3/60+2/60)+1/42 =3/12+5/60+1/42 =3/12+1/12+1/42 =4/12+1/42 =1/3+1/42 =14/42 + 1/42 =15/42=5/14 Trả lời
$\frac{1}{6}$ + $\frac{1}{12}$ + $\frac{1}{20}$ + $\frac{1}{30}$ + $\frac{1}{42}$ = $\frac{1}{4}$ + $\frac{1}{12}$ + $\frac{1}{42}$ = $\frac{1}{3}$ + $\frac{1}{42}$ = $\frac{5}{14}$ Trả lời
Đáp án: 5/14
Giải thích các bước giải:
1/6+1/12+1/20+1/30+1/42
=( 1/6 + 1/12) +(1/20 +1/30)+1/42
=(2/12+1/12)+(3/60+2/60)+1/42
=3/12+5/60+1/42
=3/12+1/12+1/42
=4/12+1/42
=1/3+1/42
=14/42 + 1/42
=15/42=5/14
$\frac{1}{6}$ + $\frac{1}{12}$ + $\frac{1}{20}$ + $\frac{1}{30}$ + $\frac{1}{42}$
= $\frac{1}{4}$ + $\frac{1}{12}$ + $\frac{1}{42}$
= $\frac{1}{3}$ + $\frac{1}{42}$
= $\frac{5}{14}$