Thực hiên phép tính “A = 1 2/5 X 3/8 + 7/5 X 5/8 -7 2/5″ ” B = 2 2/5 x (2/3 – 1/6 ) + 1/3 : 2 1/3″ 15/08/2021 Bởi Valerie Thực hiên phép tính “A = 1 2/5 X 3/8 + 7/5 X 5/8 -7 2/5″ ” B = 2 2/5 x (2/3 – 1/6 ) + 1/3 : 2 1/3″
Đáp án: `A= 1 2/5 xx 3/8 + 7/5 xx 5/8 -7 2/5` `A=7/5 xx 3/8 + 7/5 xx 5/8 – 37/5` `A= 7/5 xx (3/8 + 5/8) -37/5` `A=7/5 xx 1 -37/5=7/5- 37/5=-30/5=-6` `B=2 2/5 xx (2/3 -1/6) + 1/3 : 2 1/3` `B= 12/5 xx (4/6 -1/6) + 1/3 : 7/3` `B=12/5 xx 1/2 + 1/3 xx 3/7` `B=6/5 + 1/7=42/35 + 5/35=47/35` XIN HAY NHẤT NHA anhchangtienganh Bình luận
`text{@dg}` $A=1\frac{2}{5} . \frac{3}{8} + \frac{7}{5} . \frac{5}{8} – 7 \frac{2}{5}$ $=\frac{7}{5} . \frac{3}{8} + \frac{7}{5} . \frac{5}{8} – \frac{37}{5}$ $=\frac{7}{5} . (\frac{3}{8} + \frac{5}{8}) – \frac{37}{5}$ $= \frac{7}{5} . 1 – \frac{37}{5}$ $= \frac{-30}{5} = -6$ $B= 2\frac{2}{5} . (\frac{2}{3} – \frac{1}{6}) + \frac{1}{3} : 2\frac{1}{3}$ $= \frac{12}{5} . (\frac{2}{3} – \frac{1}{6}) + \frac{1}{3} : \frac{7}{3}$ $=\frac{12}{5} . \frac{1}{2} + \frac{1}{3} : \frac{7}{3}$ $= \frac{6}{5} + \frac{1}{7}$ $=\frac{47}{35}$. Bình luận
Đáp án:
`A= 1 2/5 xx 3/8 + 7/5 xx 5/8 -7 2/5`
`A=7/5 xx 3/8 + 7/5 xx 5/8 – 37/5`
`A= 7/5 xx (3/8 + 5/8) -37/5`
`A=7/5 xx 1 -37/5=7/5- 37/5=-30/5=-6`
`B=2 2/5 xx (2/3 -1/6) + 1/3 : 2 1/3`
`B= 12/5 xx (4/6 -1/6) + 1/3 : 7/3`
`B=12/5 xx 1/2 + 1/3 xx 3/7`
`B=6/5 + 1/7=42/35 + 5/35=47/35`
XIN HAY NHẤT NHA
anhchangtienganh
`text{@dg}`
$A=1\frac{2}{5} . \frac{3}{8} + \frac{7}{5} . \frac{5}{8} – 7 \frac{2}{5}$
$=\frac{7}{5} . \frac{3}{8} + \frac{7}{5} . \frac{5}{8} – \frac{37}{5}$
$=\frac{7}{5} . (\frac{3}{8} + \frac{5}{8}) – \frac{37}{5}$
$= \frac{7}{5} . 1 – \frac{37}{5}$
$= \frac{-30}{5} = -6$
$B= 2\frac{2}{5} . (\frac{2}{3} – \frac{1}{6}) + \frac{1}{3} : 2\frac{1}{3}$
$= \frac{12}{5} . (\frac{2}{3} – \frac{1}{6}) + \frac{1}{3} : \frac{7}{3}$
$=\frac{12}{5} . \frac{1}{2} + \frac{1}{3} : \frac{7}{3}$
$= \frac{6}{5} + \frac{1}{7}$
$=\frac{47}{35}$.