X x 5=70
1022 x 5 x 70 x 5 x 1 = ?
1022 * 5 * 70 * 5 * 1 = 178 500
1022 x 5 x 70 x 5 x 1 = 1788500
Tìm x
a, 240 : +65 .4 = ( x + 175 ) : 5 + 30
b,( 32 . 5 ) :2 = (x + 70 ) : 14 - 2
c, x- 4867 = ( 175 . 2050 . 70 )
Khoanh vào đáp án đúng :
1:Đúng ghi Đ, sai ghi S:
a) (36 x 14) : 3 = 44 ....
b) (64 x 32 ) :5 = 70 ....
c) (12 x 24 ) :6= 256 ....
d) (50 x 7 ) :5 = 70 .....
Tim x: 70⋮x ; 84⋮x và x>5
` ƯC(70, 84) = 1, 2, 7, 14`.
Mà `x > 5`
`=> x = 7, 14`.
`70\vdots x;84\vdots x=>x inƯC(70;84)`
`ƯCLN(70;84)=14`
`=>ƯC(70;84)=Ư(14)={1;2;7;14}`
Vì `x>5` nên `x in {7;14}`
Tìm x, biết
a) 575 – (6X + 70) = 445
b) (32.15) : 2 = (X +70) : 14 – 40
c) (X – 15) -75 = 0 d) 420 + 65.4 = (X + 175):5 +30
e) X – 4867 = (175.2050.70) : 25 + 23 f) [(X + 32) -17].2 = 42
g) 96 – 3.(X+1)=42 h) 165 – 19.(35 : X + 3) = 13
\(a,\Rightarrow6x+70=130\Rightarrow6x=60\Rightarrow x=10\\ b,\Rightarrow240=\left(x+70\right):14-40\\ \Rightarrow\left(x+70\right):14=280\\ \Rightarrow x+70=3920\Rightarrow x=3850\\ c,\Rightarrow x-15=75\Rightarrow x=90\\ d,\Rightarrow\left(x+175\right):5=680-30=650\\ \Rightarrow x+175=3250\Rightarrow x=3075\\ e,\Rightarrow x-4867=1004523\Rightarrow x=1009390\\ f,\Rightarrow x+32-17=24\Rightarrow x=9\\ g,\Rightarrow3\left(x+1\right)=54\Rightarrow x+1=18\Rightarrow x=17\\ h,\Rightarrow19\left(35:x+3\right)=152\\ \Rightarrow35:x+3=8\Rightarrow35:x=11\Rightarrow x=\dfrac{35}{11}\)
phân tích 70 ra thừa số nguyên tố ta được:70=2^x.5^y.7^z tổng x+y+z=?
\(70=2\cdot5\cdot7\)
x+y+z=3
70-5(x-3)=40 tìm x
\(70-5\left(x-3\right)=40\\ \Rightarrow5\left(x-3\right)=30\\ \Rightarrow x-3=6\Rightarrow x=9\)
Câu hỏi của Nguyễn Châu Hoàng Phương - Toán lớp 6 - Học trực tuyến OLM
Tham khảo ở đây
70-5.(x-3)=45 tìm x
\(70-5\left(x-3\right)=45\)
\(\Rightarrow5\left(x-3\right)=30\)
\(\Rightarrow x-3=6\Rightarrow x=9\)
\(70-5\left(x-3\right)=45\)
\(\Leftrightarrow5\left(x-3\right)=25\)
\(\Leftrightarrow x-3=5\)
hay x=8
70-5(x -3)= -45 tìm x
70-5(x-3)=-45
=>5(x-3)=70+45=115
=>x-3=23
=>x=23+3=26
70 - 5(x - 3) = -45
=> 5(x - 3) = 70 - (-45)
=> 5(x - 3) = 115
=> x - 3 = 23
=> x = 26
tim x: X x 3/5 + X x 3/7 = 31/70
X x 3/5+ Xx 3/7=31/70
=>X x (3/5+3/7)=31/70
=>X x 36/35=31/70
=>X=31/70:36/35
=>X=31/72
X x 3/5+ Xx 3/7=31/70
=>X x (3/5+3/7)=31/70
=>X x 36/35=31/70
=>X=31/70:36/35
=>X=31/72
X x 3/5+ Xx 3/7=31/70
=>X x (3/5+3/7)=31/70
=>X x 36/35=31/70
=>X=31/70:36/35
=>X=31/72