Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](https://rs.olm.vn/images/avt/0.png?1311)
a)3/8x6/5+15/8:8
=9/20+15/64
=219/320
b)7/99:3,4x0,25
=35/1683x0,25
=35/6732
c)15,3-21,93:3,4
=15,3-129/20
=177/20
![](https://rs.olm.vn/images/avt/0.png?1311)
x : 0,25 + x x 0,25 = 3,4
x : 25/100 + x x 0,25 = 3,4
x x 4 + x x 0,25 = 3,4
x x (4 + 0,25 ) = 3,4
x x 4,25 = 3,4
x = 3,4 : 4,25
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,2,3:0,25+7,7.4\\ =2,3.4+7,7.4\\ =\left(2,3+7,7\right).4=10.4=40\\ b,4,2.8+5,8:0,125\\ =4,2.8+5,8.8\\ =\left(4,2+5,8\right).8=10.8=80\\ c,3,4.4+5,6:0,25+4\\ =3,4.4+5,6.4+4\\ =\left(3,4+5,6+1\right).4=10.4=40\\ d,4:0,2+12:0,5+1,2:0,25\\ =4.5+12.2+1,2.4\\ 4.5+6.4+1,2.4\\ =4\left(5+6+1,2\right)\\ =4.12,2=48,8\)
![](https://rs.olm.vn/images/avt/0.png?1311)
10,6+1,75+7,625+10,25+3,875+3,4
12,35+17,875+7,275
30,225+7,275
37,5
\(5\frac{3}{5}+1,75+6\frac{1}{8}+4\frac{1}{4}+3.875+3,4\)
\(=5,6+1,75+6,125+4,25+3,875+3,4\)
\(=\left(5,6+3,4\right)+\left(1,75+4,25\right)+\left(6,125+3,875\right)\)
\(=9+6+10\)
\(=25\)
![](https://rs.olm.vn/images/avt/0.png?1311)
=15,3x(3,4+2,3)+5,7x5,3
=15,3x5,7+5,7x5,3
=5,7x(15,3+5,3)
=5,7x20,6a
=.......
=15,3 x (3,4 + 2,3 ) - 5,7 x 5,3
= 15,3 x 5,7 - 5,7 x 5,3
= 5,7 x ( 15,3 - 5,3 )
= 5,7 x 10
=57
a) = 3/8 x 5/6 + 15/8 x 1/5
=5/16 + 3/8
=11/16
b)=2,35 x 0,25
=0,5875
c)= 15,3 - 6,45
=8,85
CHÚC BẠN HỌC TỐT!
a, \(\frac{3}{8}:\frac{6}{5}+\frac{15}{8}:5\)= \(\frac{5}{16}+\frac{3}{8}\)
= \(\frac{11}{16}\)
b,7,99 : 3,4 x 0,25 = 2,35 x 0,25
= 0,5875
c,15,3 - 21,93 : 3,4 = 15,3 - 6,45
= 8,85