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Đề tự chép lại nha!
\(\left(16\frac{2}{7}-28\frac{2}{7}\right)\):\(\left(\frac{-3}{5}\right)\)
= -12 :\(\left(\frac{-3}{5}\right)\)
= 20
Hk tốt
\(16\frac{2}{7}\div\frac{-3}{5}-28\frac{2}{7}\div\frac{-3}{5}\)
\(=\left[\left(16-28\right)\frac{2}{7}\right]\div\frac{-3}{5}\)
\(=-12\frac{2}{7}\div\frac{-3}{5}\)
\(=\frac{-84}{7}\div\frac{-3}{5}\)
\(=-12\div\frac{-3}{5}\)
\(=20\)
Học tốt!!!
1: Ta có: \(23\dfrac{1}{4}\cdot\dfrac{7}{5}-13\dfrac{1}{4}:\dfrac{5}{7}\)
\(=\dfrac{93}{4}\cdot\dfrac{7}{5}-\dfrac{53}{4}\cdot\dfrac{7}{5}\)
\(=\dfrac{7}{5}\cdot10=14\)
2: Ta có: \(\left(1+\dfrac{2}{3}-\dfrac{1}{4}\right)\left(\dfrac{4}{5}-\dfrac{3}{4}\right)^2\)
\(=\dfrac{12+8-3}{12}\cdot\dfrac{1}{400}\)
\(=\dfrac{17}{12}\cdot\dfrac{1}{400}=\dfrac{17}{4800}\)
a)\(x=\left(\dfrac{3}{56}\cdot\dfrac{28}{9}\right):\dfrac{-3}{7}=\dfrac{1}{6}:\dfrac{-3}{7}=-\dfrac{7}{18}\)
b)\(x=\left(\dfrac{7}{15}\cdot\dfrac{5}{3}\right)+\dfrac{3}{16}=\dfrac{7}{9}+\dfrac{3}{16}=\dfrac{139}{144}\)
1) \(35.18-5.7.28\)
\(=35.18-35.28\)
\(=35.\left(18-28\right)\)
\(=35.\left(-10\right)\)
\(=-350\)
2) \(45-5.\left(12+9\right)\)
\(=45-60-45\)
\(=\left(45-45\right)-60\)
\(=0-60\)
\(=-60\)
3) \(24.\left(16-5\right)-16.\left(24-5\right)\)
\(=\left(384-120\right)-\left(384-120\right)\)
\(=264-264\)
\(=0\)
4) \(13.\left(23+22\right)-3.\left(17+28\right)\)
\(=13.45-3.45\)
\(=\left(13-3\right).45\)
\(=10.45\)
\(=450\)
tk ủng hộ nha!!!!!!!!1
1/ 35 . 18 - 5 . 7 . 28
= 35 . 18 - 35 . 28
= 35 . (18 - 28)
= 35 . (-10)
= -350
2/ 45 - 5 . (12 + 9)
= 5 . 9 - 5 . 12 + 5 . 9
= 5 . (9 - 12 + 9)
= 5 . 6
= 30
3/ 24 . (16 - 5) - 16 . (24 - 5)
= 24 . 16 - 24 . 5 - 16 . 24 - 16 . 5
= (24 . 16 - 16 . 24) - (24 . 5 - 16 . 5)
= 0 - [5 . (24 - 16)]
= 0 - [5 . 8]
= 0 - 40
= -40
4/ 13 . (23 + 22) - 3 . (17 + 28)
= 13 . 45 - 3 . 45
= 45 . (13 - 3)
= 45 . 10
= 450
16+3(x-7)=43
3(x-7)=43-16
a,3(x-7)=27
x-7=27:3
x-7=9
x=9+7
x=16
b,28-2(x+5)=14
2(x+5)=28-14
2(x+5)=14
x+5=14:2
x+5=7
x=7-5
x=2
a) <-->\(3\left(x-7\right)=43-16\)
<--> \(3x-21=27\)
<--> \(3x=27+21\)
<--> \(3x=48\)
<--> \(x=16\)
b) <--> \(-2\left(x+5\right)=14-28\)
<--> \(-2\left(x+5\right)=-14\)
<--> \(-2x-10=-14\)
<--> \(-2x=-14+10\)
<--> \(-2x=-4\)
<--> \(x=2\)
\(16\frac{2}{7}\):\(\left(\frac{-3}{5}\right)\)+ \(28\frac{2}{7}\):\(\frac{3}{5}\)
= \(-16\frac{2}{7}\):\(\frac{3}{5}\)+\(28\frac{2}{7}\):\(\frac{3}{5}\)
=(\(-16\frac{2}{7}\)+\(28\frac{2}{7}\)) : \(\frac{3}{5}\)
=12 : \(\frac{3}{5}\)=12.\(\frac{5}{3}\)=20