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\(A=\dfrac{\dfrac{2}{3}+\dfrac{2}{5}-\dfrac{2}{9}}{\dfrac{4}{3}+\dfrac{4}{5}-\dfrac{4}{9}}\\ =\left(\dfrac{2}{3}+\dfrac{2}{5}-\dfrac{2}{9}\right):\left(\dfrac{4}{3}+\dfrac{4}{5}-\dfrac{4}{9}\right)\\ =\left[2\left(\dfrac{1}{3}+\dfrac{1}{5}-\dfrac{1}{9}\right)\right]:\left[4\left(\dfrac{1}{3}+\dfrac{1}{5}-\dfrac{1}{9}\right)\right]\\ =2\left(\dfrac{1}{3}+\dfrac{1}{5}-\dfrac{1}{9}\right):4\left(\dfrac{1}{3}+\dfrac{1}{5}-\dfrac{1}{9}\right)\\ =\dfrac{2}{4}\\ =\dfrac{1}{2}\)
\(A=\dfrac{\dfrac{2}{3}+\dfrac{2}{5}-\dfrac{2}{9}}{\dfrac{4}{3}+\dfrac{4}{5}-\dfrac{4}{9}}\\ A=\left(\dfrac{2}{3}+\dfrac{2}{5}-\dfrac{2}{9}\right):\left(\dfrac{4}{3}+\dfrac{4}{5}-\dfrac{4}{9}\right)\\ A=\left(\dfrac{30}{45}+\dfrac{18}{45}-\dfrac{10}{45}\right):\left(\dfrac{60}{45}+\dfrac{36}{45}-\dfrac{20}{45}\right)\\ A=\dfrac{38}{45}:\dfrac{76}{45}\\ A=\dfrac{38}{76}\)
3/2:9/4=3/2x4/9=12/18=2/3=40/60
48/55:12/11=48/55x11/12=4x/15=4/5=48/60
7/10:7/5=1/2=30/60
6/7:8/7=3/4=45/60
mà 30<40<45<48
nên 1/2<2/3<3/4<4/5
(3x-2)3=2.32
(3x-2)3=64
(3x-2)3=43
3x-2=4
3x=4+2
3x=6
x=6:3
x=2
Chúc bạn học tốt !
12.35 + 35.182 + 35.94
= 35.( 12 + 182 - 94 )
= 35.100
= 3500
\(a,\frac{7}{x}=\frac{x}{28}=>x\cdot x=28\cdot7=>x^2=196=>x^2=14^2\)\(=>x=14\)
\(b,\frac{10+x}{x+17}=\frac{3}{4}=>\left(10+x\right)\cdot4=\left(x+17\right)\cdot3=>40+x4=x3+51\)\(=>x4-x3=51-40=>x=11\)
Trong 1 giờ đi được: 8:2/3=12(km)
12 Km
HT