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x+126/216=204/216-24/216
=>x+126/216=108/216
=>x=108/216-126/216
=>x=-18/216
=>x=-1/12
a ) x + 7/12 = 17/18 - 1/9
x + 7/12 = 17/18 - 2/18
x + 7/12 = 5/18
x = 5/18 - 7/12
x = 10/36 - 21/36
x = -11/36
b ) 29/30 - ( 13/23 + x ) = 7/69
29/30 - 13/23 - x = 7/69
29/30 - 39/69 - x = 7/69
29/30 - x = 7/69 + 39/69
29/30 - x = 46/69
x = 29/30 - 46/69
x = 3/10
c ) x + 1/4 - 1/3 = 7/46
x + 3/12 - 4/12 = 7/46
x + -1/12 = 7/46
x = 7/46 + 1/12
x = 65/276
Tk mình nha !!! Chúc học giỏi !!!
Ai thấy đúng TK mình nhé !!!!
a, x + 7/12 = 17/18 - 1/9
x + 7/12 = 15/18
x = 15/18 - 7/12
x = 1/4
b, 29/30 - ( 13/23 + x ) = 7/69
( 13/23 + x ) = 29/30 - 7/69
13/23 + x = 199/230
x = 199/230 - 13/23
x = 3/10
hok tốt
-29.(85-47)-85.(47-29)
=-29.38-85.18
=-1102-1503
=-2605
-15.(23-29)+23-(15-29)
=-15.(-6)+23-(-14)
=90+23+14
=113+14
=127
-13.(55-29)+23.(15-29)
=-13.26+23.(-14)
=-338+(-322)
=-660
-10.(2+4)-5.(4-3)
=-10.6-5.1
=-60-5
=-65
a ) \(-\frac{13}{30}+\frac{11}{20}-\frac{7}{15}\)
\(=-\frac{26}{60}+\frac{33}{60}-\frac{28}{60}\)
\(=\frac{-26+33-28}{60}=-\frac{7}{20}\)
b ) \(-\frac{5}{72}:\left(\frac{3}{8}.\frac{7}{9}\right)\)
\(=-\frac{5}{72}:\frac{3.7}{8.9}\)
\(=-\frac{5}{72}:\frac{7}{24}\)
\(=-\frac{5}{72}.\frac{24}{7}=-\frac{5}{21}\)
a) \(\frac{-13}{30}+\frac{11}{20}-\frac{7}{15}=\frac{-26}{60}+\frac{33}{60}-\frac{28}{60}=-\frac{21}{60}=-\frac{7}{20}\)
b) \(\frac{-5}{72}:\left(\frac{3}{8}.\frac{7}{9}\right)=\frac{-5}{72}:\frac{7}{24}=-\frac{5}{21}\)
c) \(\frac{-23}{25}.\frac{10}{13}+\frac{-23}{25}.\frac{3}{13}+\frac{-27}{25}\)
\(=\frac{-23}{25}.\left(\frac{10}{13}+\frac{3}{13}\right)+\frac{-27}{25}\)
\(=\frac{-23}{25}+\frac{-27}{25}\)
\(=\frac{-50}{25}=-2\)
Đáp án cần chọn là: A
29 30 − 13 23 + x = 7 69 13 23 + x = 29 30 − 7 69 13 23 + x = 199 230 x = 199 230 − 13 23 x = 3 10