5(x+12)+22=
Giải thích sự tương đương: x – 5 < 12 ⇔ x + 5 < 22
Cộng hai vế của bất phương trình x – 5 < 12 với 10.
tính nhanh : 2/3 x 10/21 x 3/2 22/5 x 12 x 5/22
(2/3x3/2) x10/21= 1 x10/21 =10/21
22/5x5/22 x12 = 1x12 =12
Tính bằng cách thuận tiện
a) 5 x 11 x 15 x 18/6 x 15 x 22 x 10
b) 7/12 x 3/5 + 3/5 x 5/12
a, \(\dfrac{5\times11\times15\times18}{6\times15\times22\times10}\)
= \(\dfrac{5\times11\times15\times6\times3}{6\times15\times11\times2\times2\times5}\)
= \(\dfrac{5\times11\times15\times6}{5\times11\times15\times6}\) \(\times\) \(\dfrac{3}{2\times2}\)
= 1 \(\times\) \(\dfrac{3}{4}\)
= \(\dfrac{3}{4}\)
b, \(\dfrac{7}{12}\) \(\times\) \(\dfrac{3}{5}\) + \(\dfrac{3}{5}\) \(\times\) \(\dfrac{5}{12}\)
= \(\dfrac{3}{5}\) \(\times\) ( \(\dfrac{7}{12}+\dfrac{5}{12}\))
= \(\dfrac{3}{5}\) \(\times\) \(\dfrac{12}{12}\)
= \(\dfrac{3}{5}\) \(\times\) 1
= \(\dfrac{3}{5}\)
tính nhanh: a) 4/9 x 3/7 + 2 x 4/9 x 2/7- 1/9 -3/9
b) 22/5 x 12 x 5/22
1, =4/9 x (3/7 + 2 x 4/7) - 1/9 - 3/9
= 4/9 x 1 - 1/9 - 3/9 = 0
2, = ( 22/5 x 5/22 ) x 12
= 1 x 12 = 12
tính nhanh :
a, 2/3 x 10/21 x 3/2
b, 22/5 x 12 x 5/22
lời giải phép tính nha
a, \(\frac{2}{3}\)x \(\frac{10}{21}\)x \(\frac{3}{2}\)= \(\frac{2x10x3}{3x21x2}\) = \(\frac{10}{21}\)
b, \(\frac{22}{5}\)x \(12\)x\(\frac{5}{22}\) = \(\frac{22x12x5}{5x22}\) = \(12\)
a = 10/21
b = 12
kết bạn mk nha. và tk nữa. thanks
Tính (theo mẫu):
4 x 3 + 10 = 12 + 10
= 22
5 x 5 + 18 =
5.( x+12) + 22 = 92
5. (x+12) = 92 - 22
5. (x+12) = 70
x+12 = 70 : 5
x+12 =14
x = 14 - 12
x = 2
5(x+12) + 22= 92
5(x+12) = 70
x + 12 = 14
x = 2
5(3-x)+12=22
5(3-x) = 22-12
5.3 - 5.x = 10
15 - 5x =10
5x = 15 -10
5x = 5
x = 1
vậy x = 1
k nha
\(5\left(3-x\right)+12=22\)
\(\Rightarrow15-5x+12-22=0\)
\(\Rightarrow5-5x=0\)
\(\Rightarrow5x=5\)
\(\Rightarrow x=1\)
5(x+12)+22=92
5(x+12)+22= 92
5(x+12) = 92-12
5(x+12) = 80
(x+12) = 80:5
(x+12) = 16
x = 16-12
x = 4
k mk nha
5(x+12)+22=92 5(x+12)=92-22 5(x+12)=70 x+12=70:5 x+12=14 x=14-12 x=2
5(x + 2) + 22 = 92
5(x +2) = 92 - 22
5(x + 2) = 70
x + 2 = 70: 5
x + 2 = 14
x = 14 - 2
x = 12
ủng hộ mk nha !!!! ^_^
5.(x+12)+22=92
5. ( x + 12 ) + 22 = 92
5. ( x + 12 ) = 92 - 22
5. ( x + 12 ) = 70
x + 12 = 70 : 5
x + 12 = 14
x = 14 - 12
x = 2
5.(x+12)+22=92
=>5.(x+12)=92-22
=>5.(x+12)=70
=>x+12=70:5
=>x+12=14
=>x=14-12
=>x=2
5. ( x + 12 ) + 22 = 92
5. ( x + 12 ) = 92 - 22
5. ( x + 12 ) = 70
x + 12 = 70 : 5
x + 12 = 14
x = 14 - 12
x = 2