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a.(x + 125) : 312 = 14 (dư 300)
x+125 = 14 x 312 + 300
x+125 = 4 668
x= 4 668 - 125
x=4 543
b.(x-234):23=128 (dư 21)
x-234=128 x 23 + 21
x-234=2 965
x=2 965 + 234
x=3 199
c.(x-24) x 2020=2020x33
(x-24)x2020=66 660
x-24=66 660:2020
x-24=33
x=33+24
x=57
d.5 x (x+2019)=3800 x 5
5 x (x+2019)=19 000
x+2019=19000:5
x+2019=3800
x=3800-2019
x=1 781
HẾT=)))
a.(x + 125) : 312 = 14 (dư 300)
x+125 = 14 x 312 + 300
x+125 = 4 668
x= 4 668 - 125
x=4 543
b.(x-234):23=128 (dư 21)
x-234=128 x 23 + 21
x-234=2 965
x=2 965 + 234
x=3 199
c.(x-24) x 2020=2020x33
(x-24)x2020=66 660
x-24=66 660:2020
x-24=33
x=33+24
x=57
d.5 x (x+2019)=3800 x 5
5 x (x+2019)=19 000
x+2019=19000:5
x+2019=3800
x=3800-2019
x=1 781
HẾT=)))
a) (y + 5) x 2020 = 205 x 2020
(y + 5) x 2020 = 414100
y + 5 = 414100 : 2020 = 205
y = 205 - 5 = 200
a) y= 200
b) y-45600 = 1600 × 4 ×25
y-45600=160000
y= 114400
54 x 5 + 54 x 2 +54 x ...=594 đố các bạn điền số mấy vào ô trống
\(4x2020x25-5x2029x20\)
\(=2020x25x4-5x20x2029\)
\(=2020x100-100x2029=100x\left(2020-2019\right)=100.1=100\)
a: 7/8<8/9<9/10<10/11<11/12
b: 4/5<5/6<6/7<7/8
c: 1/3<3/5<7/9<9/11<11/13
a) 13/27 + 5/8 + 14/27 = (13/27 + 14/27) + 5/8 = 1 + 5/8 = 13/8
b) 4 + 11/25 + 39/25 = 4 + (11/25 + 39/25) = 4 + 50/25 = 4 + 2 = 6
a)\(\frac{13}{27}+\frac{5}{8}+\frac{14}{27}=\left(\frac{13}{27}+\frac{14}{27}\right)+\frac{5}{8}=1+\frac{5}{8}=\frac{13}{8}\)
\(=\frac{13}{8}\)
b)\(4+\frac{11}{25}+\frac{39}{25}=4+\left(\frac{11}{25}+\frac{29}{25}\right)=4+\frac{8}{5}\)
\(=\frac{28}{5}\)
\(a.=\dfrac{2019}{2020}\times\left(\dfrac{4}{11}+\dfrac{5}{11}+\dfrac{2}{11}\right)\\ =\dfrac{2019}{2020}\times1=\dfrac{2019}{2020}\\ b.=\dfrac{25}{27}\times\left(\dfrac{17}{14}-\dfrac{1}{14}-\dfrac{2}{14}\right)\\ =\dfrac{25}{27}\times1=\dfrac{25}{27}\)