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348 : 2 + 76 - 48 : 2 + 24
= ( 348 : 2 - 48 : 2 ) + ( 76 + 24 )
= ( 348 - 48 ) : 2 + 100
= 300 : 2 + 100
= 150 + 100
= 250
Tính bằng cách thuận tiện nhất:
348 : 2 + 76 - 48 : 2 + 24
= ( 348 - 48 ) : 2 + ( 76 + 24 )
= 300 : 2 + 100
= 150 + 100
= 250
Hok tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
(16 x 48) + (2 x 48 x 4) +(7 x 32 x 2)
= 768 + 384 + 448
=1600
giải thích thế thôi thêm là hơi hoa mắt đấy
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{48}{54}-x=\frac{7}{8}\Rightarrow\frac{8}{9}-x=\frac{7}{8}\)
\(\Rightarrow x=\frac{8}{9}-\frac{7}{8}=\frac{8\cdot8-9\cdot7}{72}=\frac{1}{72}\)
Vậy \(x=\frac{1}{72}\)
\(\frac{55}{60}-x=\frac{30}{45}\Rightarrow\frac{11}{12}-x=\frac{2}{3}\)
\(\Rightarrow\frac{11}{12}-\frac{12x}{12}=\frac{8}{12}\)
\(\Rightarrow11-12x=8\)
\(\Rightarrow12x=3\)
\(\Rightarrow4x=1\Rightarrow x=\frac{1}{4}\)
Vậy \(x=\frac{1}{4}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
(a x 5 + a x4 + a) x ( 6+ 2 ) x 2 = 290 x 2 x 1 - ( 0 x 1000)
(a x 5 + a x4 + a) x ( 6+ 2 ) x 2 = 290 x 2 x 1 - 0
(a x 5 + a x4 + a) x ( 6+ 2 ) x 2 = 580
a x (5 + 4 + 1) x 8 x 2 = 580
a x 10 x 16 = 580
a x 160 = 580
a = 580 : 160
a = 3,625
HT và $$$
And rảnh thì vào kênh TienDBfan để xem nha
![](https://rs.olm.vn/images/avt/0.png?1311)
`@` `\text {Ans}`
`\downarrow`
`A)`
`37 \times 46+37 \times 51+111`
`= 37 \times (46+51)+111`
`= 37 \times 97+111`
`= 3589 +111`
`= 3700`
`B)`
`35 \times 215-35 \times 210-175`
`= 35 \times (215-210)-175`
`= 35 \times 5-175`
`= 175-175=0`
`E)`
`76 \times 102-76 \times 2`
`= 76 \times (102-2)`
`= 76 \times 100`
`= 7600`
`C)`
`85 \times 94+85 \times 2 +170 \times 2`
`= 85 \times (94+2) + 170 \times 2`
`= 85 \times 96+170 \times 2`
`= 8160+340`
`= 8500`
`48 \times 56+28 \times 104`
`= 48 \times 28 \times 2+28 \times 104`
`= 28 \times (48 \times 2+104)`
`= 28 \times (96+104)`
`= 28 \times 200`
`= 5600`
`G)`
`206 \times 12-206-206`
`= 206 \times (12-1-1)`
`= 206 \times 10`
`= 2060`
a) 37 x 46 + 37 x 51 + 111
= 37 x ( 46 + 51 ) + 111
= 37 x 97 + 111
= 3589 + 111
= 3700
b) 35 x 215 - 35 x 210 - 175
= 35 x ( 215 - 210 ) - 175
= 35 x 5 - 175
= 175 - 175
= 0
e) 76 x 102 - 76 x 2
= 76 x ( 102 - 2 )
= 76 x 100
= 7600
c) 85 x 94 + 95 x 2 + 170 x 2
= 7990 + 2 x ( 95 + 170 )
= 7990 + 2 x 265
= 7990 + 530
= 8520
48 x 56 + 28 x 104
= 2688 + 2912
= 5600
g) 206 x 12 - 206 - 206
= 2472 - 206 - 206
= 2266 - 206
= 2060
![](https://rs.olm.vn/images/avt/0.png?1311)
\(X\) + \(\frac{2}{3}\)= \(\frac{23}{12}\)
\(X\)= \(\frac{23}{12}\)- \(\frac{2}{3}\)
\(X\)= \(\frac{5}{4}\)
\(X\): \(\frac{1}{2}\) = 5
\(X\)= 5 x \(\frac{1}{2}\)
\(X\)= \(\frac{5}{2}\)
x + 2/3 = 23/12
x = 23/12 - 2/3
x = 5/4
x : 1/2 = 5
x = 5 x 1/2
x = 5/2
348 chia cho cái j vậy
348 : + 76
Nghĩa là 348 : 76
Ta có : 348 : 76 - 48 : 2 + 24
= \(\frac{87}{19}\)- 24 + 24
= \(\frac{87}{19}\)+ ( 24 - 24 )
= \(\frac{87}{19}\)+ 0
=\(\frac{87}{19}\)