x + 70 = 40 x 2
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 10 x 7 = ? Nhẩm: 1 chục x 7 = 7 chục 10 x 7 = 70 20 x 4 = ? Nhẩm: 2 chục x 4 = 8 chục 20 x 4 = 80 40 x 2 = ? Nhẩm: 4 chục x 2 = 8 chục 40 x 2 = 80 30 x 3 = ? Nhẩm: 3 chục x 3 = 9 chục 30 x 3 = 90 | b) 60 : 2 = ? Nhẩm: 6 chục : 2 = 3 chục 60 : 2 = 30 90 : 3 = ? Nhẩm: 9 chục : 3 = 3 chục 90 : 3 = 30 70 : 7 = ? Nhẩm: 7 chục : 7 = 1 chục 70 : 7 = 10 40 : 2 = ? Nhẩm: 4 chục : 2 = 2 chục 40 : 2 = 20 |
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
525:2=(x+70):14-40
262,5=(x+70):14-40
Ta có:(x+70):14-40=262,5
(x+70):14 =262,5+40
(x+70):14 =302,5
x+70 =302,5*14
x+70 =4235
x+70
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(32.15\right):2=\left(x+70\right):14-40\)
\(480:2=\left(x+70\right):14-40\)
\(240=\left(x+70\right):14-40\)
\(240-40=\left(x+70\right):14\)
\(200=\left(x+70\right):14\)
\(200.14=x+70\)
\(2800=x+70\)
\(2800-70=x\)
\(2730=x\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(32\cdot15\right):2=\left(x+70\right):14-40\)
\(=240=\left(x+70\right):14-40\)
\(\Rightarrow\left(x+70\right):14=240+40\)
\(\Rightarrow x+70=280\cdot14\)
\(\Rightarrow x=3920-70\)
\(\Rightarrow x=3850\)
Ủng hộ mk nkoa!@^_^@
(32.15):2=(x+70):14-40
=>(x+70):14-40=480:2=240
=>(x+70):14=240+40=280
=>x+70=280x14=3920
=>x=3920-70=3850
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 86 – 16 = 70
b) 23 x 2 – 1 = 23
c) 250 : 5 + 5 = 25
d) 40 + 80 : 4 = 30
e) 80 + 4 : 2 = 42
f) 70 + 30 : 2 = 50
g) 90 + 30 x 3 = 180
h) 70 + 30 : 2 = 85
![](https://rs.olm.vn/images/avt/0.png?1311)
(32.15):2=(x+70):14-40
=>480:2=(x+70):14-40
=>240=(x+70):14-40
=>(x+70):14=240+40
=>(x+70):14=280
=>x+70=280*14
=>x+70=3920
=>x=3850
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 195 - x: 17 = 125
x : 17 = 195 - 125 = 70
x = 70 . 17
x = 1190
b) 32 . 15 : 2 = (x + 70) : 14 - 40
240 = ( x + 70) : 14 - 40
(x + 70) : 14 = 280
x + 70 = 280 . 14 = 3920
x = 3920 - 70
x = 3850
A)195-x:17=125
=\(x:17=195-125\)
\(x:17=70\)
\(x=70.17\)
=>x=\(1190\)
B) 32.15:2=(x+70):14-40
\(\text{B) 32.15:2=(x+70):14-40}\)
\(=480:2=\left(x+70\right):14-40\)
\(=\left(x+70\right):14-40=240\)
\(=\left(x+70\right):14=240+40\)
\(\left(x+70\right):14=280\)
=>\(x+70=280.14\)
\(x+70=3920\)
=> x=\(3920-70\)
=>x=\(3850\)
x + 70 = 40 x 2
x + 70 = 80
x = 80 - 70
x = 10
tk nhé, mik tk bạn rồi
x + 70 = 40 x 2
x + 70 = 80
x = 80 - 70
x = 10