432/45 + x = 24,3
823,2 / 8,4 - x = 0
(754,4 + 333,1) / x = 87
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a, =87[-17+(-83)]
=87.(-100)
=-8700
b, =(-45)+-(45).432-432.(-45)
(-45)+(-45)(432-432)
=(-45)+0
=-45
a) 13 + 98 x 12 = 13 + 1176 = 4489
b) 78 x 45 + 0 = 3510 + 0 = 3510
c) 65 x 0 + 45 + 87 - 23
= 0 + 45 + 87 - 23
= 132 - 23 = 109
d) 99 + 1 x 100
= 99 + 100 = 199
Tính :
a. 13 + 98 × 12
= 13 + 1176
= 1189
b. 78 × 45 + 0
= 78 × 45
= 3510
c. 65 × 0 + 45 + 87 - 23
= 0 + 45 + 87 - 23
= 45 + 87 - 23
= 132 - 23
= 109
d. 99 + 1 × 100
= 99 + 100
= 199
9876 : 90 = \(\dfrac{1646}{5}\).
543 : 98 = \(\dfrac{543}{98}.\)
432 x 67 = 28944.
8976 : 87 = \(\dfrac{2992}{29}.\)
`@` `\text {Ans}`
`\downarrow`
`a)`
`x \div ( 8,4 + 16,6 ) = 1,8 \times 3`
`x \div 25 = 5,4`
`x = 5,4 \times 25`
`x = 135`
Vậy, `x = 135.`
`b)`
`x \div ( 91,5 - 83,6) = 45`
`x \div 7,9 = 45`
`x = 45 \times 7,9`
`x = 355,5`
Vậy, `x = 355,5`
`c)`
`x \div ( 34 - 24,7) = 207`
`x \div 9,3 = 207`
`x = 207 \times 9,3`
`x =1925,1`
Vậy, `x = 1925,1.`
Tìm x:
a) \(x:\left(8,4+16,6\right)=1,8\times3\)
\(x:\left(8,4+16,6\right)=5,4\)
\(x:25=5,4\)
\(x=5,4\times25\)
\(x=135\)
b) \(x:\left(91,5-83,6\right)=45\)
\(x:7,9=45\)
\(x=45\times7,9\)
\(x=355,5\)
c) \(x:\left(34-24,7\right)=207\)
\(x:9,3=107\)
\(x=107\times9,3\)
\(x=995,1\)
\(70-5\cdot\left(x-3\right)=45\)
\(\Rightarrow5\cdot\left(x-3\right)=70-45\)
\(\Rightarrow5\cdot\left(x-3\right)=25\)
\(\Rightarrow x-3=\dfrac{25}{5}\)
\(\Rightarrow x-3=5\)
\(\Rightarrow x=5+3=8\)
==============
\(10+2\cdot x=4^5:4^3\)
\(\Rightarrow10+2\cdot x=4^2\)
\(\Rightarrow10+2\cdot x=16\)
\(\Rightarrow2\cdot x=16-10\)
\(\Rightarrow2\cdot x=6\)
\(\Rightarrow x=\dfrac{6}{2}=3\)
=============
\(2\cdot x-138=2^3\cdot3^2\)
\(\Rightarrow2\cdot x-138=72\)
\(\Rightarrow2\cdot x=72+138\)
\(\Rightarrow2\cdot x=210\)
\(\Rightarrow x=\dfrac{210}{2}=105\)
==============
\(231-\left(x-6\right)=1339:12\)
\(\Rightarrow231-x+6=1339:12\)
\(\Rightarrow237-x=\dfrac{1339}{12}\)
\(\Rightarrow x=237-\dfrac{1339}{12}\)
\(\Rightarrow x=\dfrac{1505}{12}\)
432/45 + 14.7 = 24.3
823.2 / 8.4 - 98 = 0
(754.4 + 333.1 ) / 12.5 = 87
\(\frac{432}{45}+x=24,3\)
\(\Leftrightarrow9,6+x=24,3\)
\(\Leftrightarrow x=24,3-9,6=14,7\)
\(823,2:84-x=0\)
\(\Leftrightarrow98-x=0\Leftrightarrow x=98\)
\(\frac{754,4+333,1}{x}=87\)
\(\Leftrightarrow754,4+333,1=87x\)
\(\Leftrightarrow1087,5=87x\)
\(\Rightarrow x=1087,5:87=12,5\)