Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a) (42+36):x=66
78:x=66
x=78:66
x=13/11
b) 90:x-48:x=3
(90-48):x=3
42:x=3
x=42:3
x= 14
a) 42:x+36:x=66
42.1/x+36.1/x=66
1/x.(42+36)=66
1/x=11/13
x=1:11/13
x=13/11
b) 90:x-48:x=3
90.1/x-48.1/x=3
1/x(90-48)=3
1/x=1/14
x=14
`@` `\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
\(=\left(\dfrac{1}{21}+\dfrac{1}{210}+\dfrac{1}{2010}\right)\cdot\dfrac{10-6-3-1}{30}=0\)
\(\left(\dfrac{1}{3}-\dfrac{1}{5}-\dfrac{1}{10}-\dfrac{1}{30}\right)\times\left(\dfrac{1}{21}+\dfrac{1}{210}+\dfrac{1}{2010}\right)\)
\(=\left(\dfrac{10}{30}-\dfrac{6}{30}-\dfrac{3}{30}-\dfrac{1}{30}\right)\times\left(\dfrac{1}{21}+\dfrac{1}{210}+\dfrac{1}{2010}\right)\)
\(=0\times\left(\dfrac{1}{21}+\dfrac{1}{210}+\dfrac{1}{2010}\right)\)
\(=0\)
mk viết lại dưới dạng phân số cho dễ làm nha
a. \(\frac{42}{x}+\frac{36}{x}=6\left(x\ne0\right)\Rightarrow\frac{42+36}{x}=6\Leftrightarrow\frac{78}{x}=6\Leftrightarrow x=\frac{78}{6}=13.\)
b. \(\frac{90}{x}-\frac{48}{x}=3\left(x\ne\right)0\Rightarrow\frac{90-48}{x}=3\Leftrightarrow\frac{42}{x}=3\Leftrightarrow x=\frac{42}{3}=14\)
a)42 : x + 36: x=6
(42+36):x=6
78:x =6
x=78:6
x=13
b)90:x-48:x=3
(90-48):x=3
42:x =3
x =42:3
x =14
6(x+85)=36+210
6(x+85)= 246
x + 85 = 246 : 6
x + 85 = 41
x = 41 - 85
x = -44
a) 42 : x + 36 : x = 6
x = ( 42 + 36 ) : x = 6
x = 78 : x = 6
x = 78 : 6
x = 13
b) 90 : x - 48 : x = 3
x = (90 - 48 ) : x = 3
x = 42 : x = 3
x = 42 : 3
x = 14
cho mình một tim nhé
a) 42 : x + 36 : x = 6
( 42 + 36 ) : x = 6
78 : x = 6
x = 78 : 6 = 13
b) 90 : x - 48 : x = 3
( 90 - 48 ) : x = 3
42 : x = 3
x = 42 : 3 = 14
~~~ HT ~~~
98775 - 32 x 85
=98775 -2720
=96055
67500 - 24 x 236
= 67500 -5664
=61836
568 + 101598 : 287
= 568 +354
=922
6875 + 980 -180
=7855 -180
=7675
\(\dfrac{2}{5}+\dfrac{3}{10}-\dfrac{1}{2}\)
\(=\dfrac{7}{10}-\dfrac{1}{2}\)
= \(\dfrac{1}{5}\)
\(\dfrac{8}{11}+\dfrac{8}{33}x\dfrac{3}{4}\)
\(=\dfrac{8}{11}+\dfrac{2}{11}\)
\(=\dfrac{10}{11}\)
\(\dfrac{7}{9}x\dfrac{3}{14}:\dfrac{5}{8}\)
\(=\dfrac{1}{6}:\dfrac{5}{8}\)
\(=\dfrac{1}{6}x\dfrac{8}{5}\)
\(=\dfrac{8}{30}\)
\(=\dfrac{4}{15}\)
\(\dfrac{5}{12}-\dfrac{7}{32}:\dfrac{21}{16}\)
\(=\dfrac{5}{12}-\dfrac{7}{32}x\dfrac{16}{21}\)
\(=\dfrac{5}{12}-\dfrac{1}{6}\)
\(=\dfrac{5}{12}-\dfrac{2}{12}\)
\(=\dfrac{3}{12}=\dfrac{1}{4}\)
210 x 85 + 10 x 3 x 42 + 21 x 90 =21000
HT