145\10.... 14,5
1.mẹ cho thùy 42,2 viên bi. thùy cho trang và anh mỗi bạn 20 viên bi.hỏi thùy còn bao nhiêu viên?
2.tìm x
12,5 + x = 145 x - 14,5 = 54,1
x+31/10 =14,5+12/10
\(x+\frac{31}{10}=14,5+\frac{12}{10}\)
\(x+\frac{31}{10}=\frac{29}{2}+\frac{12}{10}\)
\(x+\frac{31}{10}=\frac{157}{10}\)
\(x=\frac{157}{10}-\frac{31}{10}\)
\(x=\frac{63}{5}\)
Học tốt #
\(x+\frac{31}{10}=14,5+\frac{12}{10}\)
\(\Rightarrow x+\frac{31}{10}=\frac{157}{10}\)
\(\Rightarrow x=\frac{157}{10}-\frac{31}{10}\)
\(\Rightarrow x=\frac{63}{5}\)
Vậy \(x=\frac{63}{5}\)
_Chúc bạn học tốt_
x+31/10=14,5+12/10
x+31/10=29/2 + 12 /10
x+31/10=145/10+12/10
x+31/10=157/10
x=157/10-31/10
x=63/5
Vậy x=63/5
Tìm x :
a) x - 7/12 = 1/3 b) x + 31/10 = 14,5 + 12/10
a,
x- 7/12 = 1/3
x = 1/3 + 7/12
x = 11/12
b,
x + 31/10 = 14,5
x = 14,5 - 31/10
x = 57/5
\(a,\\ x=\dfrac{1}{3}+\dfrac{7}{12}=\dfrac{11}{12}\\ b,\\ x+\dfrac{31}{10}=\dfrac{157}{10}\\ x=\dfrac{157}{10}-\dfrac{31}{10}=\dfrac{63}{5}\)
14,5+14,5+14,5+14,5+14,5*6-14,5/0,1
= 14,5 x 4 + 14,5 x 6 - 145
= 14,5 x 10 - 145
= 145 - 145
= 0
kc đi
phương án 1
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phương án 2
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phương án 3
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(30:15/2+0.5x3-1,5)x(9/2-7/2):(14,5-x)=10
(30:15/2+0,5.3-1,5).(9/2-7/2):(14,5-x)=10
<=>(4+1,5-1,5).1:(14,5-x)=10
<=>4:(14,5-x)=10
<=>14,5-x=2/5
<=>x=14,1
x + \(\frac{31}{10}\)= 14,5 + \(\frac{12}{10}\)
\(x+\frac{31}{10}=x+\frac{12}{10}+\frac{19}{10}=14,5+\frac{12}{10}\)
\(x+\frac{19}{10}=14,5\)
\(x+1,9=14,5\)
\(x=14,5-1,9=12,6\)
x+\(\frac{31}{10}\)=\(\frac{157}{10}\)
x=\(\frac{157}{10}-\frac{31}{10}\)
x=\(\frac{63}{5}\)
-145(13-57)+57(10-145)
1,tính
23×(145-17)-145×(23-6)
145×(13-57)+57×(10-146)
1) -145.(13 - 57) + 57.(10 -145)
2) 17.(15 - 16) + 16.( 17- 20)
3) -38.(25 - 4) + 25.(-4 + 38 )
4) 23.(145 - 17) - 145.(23 - 6)
5) 24.(15 - 4) + 4.(24 - 15)
6) 199.(15 - 17) - 199.(-17 + 5)
7) -39.(5 - 99) + 99.(10 - 39)
1: \(=-145\cdot13+145\cdot57+57\cdot10-57\cdot145=-1315\)
2: \(=17\cdot15-17\cdot16+16\cdot17-16\cdot20=255-320=-65\)
3: \(=-38\cdot25+38\cdot4-25\cdot4+25\cdot38=13\cdot4=52\)
4: \(=23\cdot145-23\cdot17-145\cdot23+145\cdot6=479\)
5: \(=24\cdot15-24\cdot4+4\cdot24-4\cdot15=360-60=300\)
6: \(=199\left(15-17+17-5\right)=199\cdot10=1990\)
7: \(=-39\cdot5+39\cdot99+99\cdot10-99\cdot39=795\)
1: =−145⋅13+145⋅57+57⋅10−57⋅145=−1315=−145⋅13+145⋅57+57⋅10−57⋅145=−1315
2: =17⋅15−17⋅16+16⋅17−16⋅20=255−320=−65=17⋅15−17⋅16+16⋅17−16⋅20=255−320=−65
3: =−38⋅25+38⋅4−25⋅4+25⋅38=13⋅4=52=−38⋅25+38⋅4−25⋅4+25⋅38=13⋅4=52
4: =23⋅145−23⋅17−145⋅23+145⋅6=479=23⋅145−23⋅17−145⋅23+145⋅6=479
5: =24⋅15−24⋅4+4⋅24−4⋅15=360−60=300=24⋅15−24⋅4+4⋅24−4⋅15=360−60=300
6: =199(15−17+17−5)=199⋅10=1990=199(15−17+17−5)=199⋅10=1990
7: =−39⋅5+39⋅99+99⋅10−99⋅39=795