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\(a.14,52\div1,5-9,81\div1,5\)
\(=\left(14,52-9,81\right)\div1,5\)
\(=4,71\div1,5=3,14\)
\(b.\frac{5}{9}:\frac{4}{7}+\frac{13}{9}\times\frac{7}{4}\)
\(=\frac{5}{9}\times\frac{7}{4}+\frac{13}{9}\times\frac{7}{4}\)
\(=\left(\frac{5}{9}+\frac{13}{9}\right)\times\frac{7}{4}\)
\(=\frac{18}{9}\times\frac{7}{4}\)
\(=2\times\frac{7}{4}\)
\(=\frac{7}{2}\)
14,52:1,5-9,81:1,5=( 14,52-9,81 ) : 1,5
=4,71:1,5
=3,14
con thứ 2 thì mình chịu, bạn tự làm nha.
học tốt lên nhé. mình chỉ biết làm luôn thôi nhé.
a) 47,54+18,72+5,13-17,54-7,72+4,87=(47,54-17,54)+(18,72-7,72)+(4,87+5,13)=30+11+10=51
b)4/7+7/13+17/9+19/13-8/9+17/7=(4/7+17/7)+(7/13+19/13)+(17/9-8/9)=3+2+1=6
\(\frac{5}{9}:\frac{4}{7}+\frac{13}{9}.\frac{7}{4}\)
= \(\frac{5}{9}.\frac{7}{4}+\frac{13}{9}.\frac{7}{4}\)
= \(\left(\frac{5}{9}+\frac{13}{9}\right).\frac{7}{4}\)
=\(\frac{18}{9}.\frac{7}{4}\)
=2.7/4 = 7/2
\(\frac{5}{9}:\frac{4}{7}+\frac{13}{9}.\frac{7}{4}\)
\(=\frac{5}{9}.\frac{7}{4}+\frac{13}{9}.\frac{7}{4}\)
\(=\frac{7}{4}.\left(\frac{5}{9}+\frac{13}{9}\right)\)
\(=\frac{7}{4}.2\)
\(=\frac{7}{2}\)
Chúc bạn học tốt ~
A = ( 2/7 + 5/7 ) + 4/9
A = 1 + 4/9
A = 13/9
B = ( 17/11 + 5/11 ) + 7/15
B = 2 + 7/15
B = 37/15
Chúc bạn học tốt~^^
A = 2/7 + 4/9 + 5/7
A = ( 2/7 + 5/7 ) + 4/9
A = 1 + 4/9
A = 13/9
Phần B làm tương tự bằng cách bỏ ngoặc nhé !
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a \(\frac{4}{18}+\frac{5}{13}+\frac{7}{9}+\frac{21}{13}\)
= \(\left(\frac{4}{18}+\frac{7}{9}\right)+\left(\frac{5}{13}+\frac{21}{13}\right)\)
= \(1+2\)
= \(3\)
b \(\frac{4}{3}-\frac{2}{7}-\frac{5}{7}+\frac{2}{3}\)
= \(\left(\frac{4}{3}-\frac{2}{3}\right)-\left(\frac{2}{7}+\frac{5}{7}\right)\)
= \(\frac{2}{3}-1\)
= \(-\frac{1}{3}\)
a,3/5*7/9+11/9*3/5-3/10=3/5*(7/9+11/9)-3/10
=3/5*18/9-3/10
=3/5*2-3/10
=6/5-3/10
=12/10-3/10
=9/10
b,14/13:1/2+3/13*2-2*7/13=14/13*2+3/13*2-2*7/13
=2*(14/13+3/13-7/13)
=2*10/13
=20/13
a/ ( 7/9 + 11/9 ) x 3/5 - 3/10
= 2 x 3/5 - 3/10
= 6/5 - 3/10
= 9/10
b/ 14/13 : 1/2 + 3/13 x 2 - 2 x 7/13
14/13 x 2/1 + 3/13 x 2 - 2 x 7/13
2 x ( 14/13 + 3/13 - 7/13 )
2 x 10/13
20/13
a) 14,25 : 1,5 - 9,81 : 1,5 = (14,25 - 9,81) : 1,5
= 4,44 : 1,5
= 2,96
b) \(\frac{5}{9}\): \(\frac{4}{7}+\frac{13}{9}\) * \(\frac{7}{4}\) = \(\frac{5}{9}\cdot\frac{7}{4}+\frac{13}{9}\cdot\frac{7}{4}\)
= \(\left(\frac{5}{9}+\frac{13}{9}\right)\cdot\frac{7}{4}\)
= 2 \(\cdot\frac{7}{4}\)
= \(\frac{7}{2}\)