\(\dfrac{3}{5}.\dfrac{5}{7}+\dfrac{12}{20}.\dfrac{2}{14}+\dfrac{9}{15}.\dfrac{1}{7}\)
\(=\dfrac{3}{7}+\dfrac{3}{35}+\dfrac{3}{35}\)
\(=\dfrac{3}{7}+\dfrac{6}{35}\)
\(=\dfrac{15}{35}+\dfrac{6}{35}\)
\(=\dfrac{21}{35}\)
\(=\dfrac{3}{5}\)
Tính nhanh:
3/5 × 5/7 + 12/20 × 2/14 + 9/15 : 73/5 x 5/7 + 12/20 x 2/14 + 9/15 : 7 ( tính nhanh)
Tính:
3/5 x 5/7 + 12/20 x 2/14 + 9/15 : 7
Tính:
3/5 x 5/7 + 12/20 x 2/14 + 9/15 : 7
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20= ?
Tính bằng cách thuận tiện nhất nha.
AI NHANH MK TÍCH
Tính nhanh
a ) 6/9 + 5/7 +1/3
b ) 17/7 + 6/5 - 20 / 14
c ) 1/2 + 1/6 +1/12 + 1/72
Tính nhanh
a ) 6/9 + 5/7 +1/3
b ) 17/7 + 6/5 - 20 / 14
c ) 1/2 + 1/6 +1/12 + 1/72
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20
ai nhanh mink tick cho
bài 1
4/7+4
3+6/11
3-5/7
21/9-2
15/24+2
63/45-20/25
3/4-2/8
6/7-5/8
37/45-5/9
46/39-11/13
5/12+3/4+1/3
1/2+3/7+11/14
7/10-(1/5+1/4)
15/4-2/3-3/4
