Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Giải:
\(9-3\times\left(x-9\right)=6\)
\(3\times\left(x-9\right)=9-6\)
\(3\times\left(x-9\right)=3\)
\(x-9=3:3\)
\(x-9=1\)
\(x=1+9\)
\(x=10\)
\(4+6\times\left(x+1\right)=70\)
\(6\times\left(x+1\right)=70-4\)
\(6\times\left(x+1\right)=66\)
\(x+1=66:6\)
\(x+1=11\)
\(x=11-1\)
\(x=10\)
\(\dfrac{x}{13}+\dfrac{15}{26}=\dfrac{46}{52}\)
\(\dfrac{x}{13}=\dfrac{23}{26}-\dfrac{15}{26}\)
\(\dfrac{x}{13}=\dfrac{4}{13}\)
\(\Rightarrow x=4\)
\(\dfrac{11}{14}-\dfrac{3}{x}=\dfrac{5}{14}\)
\(\dfrac{3}{x}=\dfrac{11}{14}-\dfrac{5}{14}\)
\(\dfrac{3}{x}=\dfrac{3}{7}\)
\(\Rightarrow x=7\)
\(5\times\left(3+7\times x\right)=40\)
\(3+7\times x=40:5\)
\(3+7\times x=8\)
\(7\times x=8-3\)
\(7\times x=5\)
\(x=5:7\)
\(x=\dfrac{5}{7}\)
\(x\times6+12:3=120\)
\(x\times6+4=120\)
\(x\times6=120-4\)
\(x\times6=116\)
\(x=116:6\)
\(x=\dfrac{58}{3}\)
\(x\times3,7+x\times6,3=120\)
\(x\times\left(3,7+6,3\right)=120\)
\(x\times10=120\)
\(x=120:10\)
\(x=12\)
\(\left(15\times24-x\right):0,25=100:\dfrac{1}{4}\)
\(\left(360-x\right):0,25=400\)
\(360-x=400.0,25\)
\(360-x=100\)
\(x=360-100\)
\(x=260\)
\(71+65\times4=\dfrac{x+140}{x}+260\)
\(\left(x+140\right):x+260=71+260\)
\(x:x+140:x+260=331\)
\(1+140:x+260=331\)
\(140:x=331-1-260\)
\(140:x=70\)
\(x=140:70\)
\(x=2\)
\(\left(x+1\right)+\left(x+4\right)+\left(x+7\right)+...+\left(x+28\right)=155\)
\(10\times x+\left(1+4+7+...+28\right)=155\)
Số số hạng \(\left(1+4+7+...+28\right)\) :
\(\left(28-1\right):3+1=10\)
Tổng dãy \(\left(1+4+7+...+28\right)\) :
\(\left(1+28\right).10:2=145\)
\(\Rightarrow10\times x+145=155\)
\(10\times x=155-145\)
\(10\times x=10\)
\(x=10:10\)
\(x=1\)
Đều theo cách lớp 5 nha em!
a, 20,22 x 103 - 202,2 x 10 - 20,22 x 3
= 202,2 x 10,3 - 202,2 x 10 - 202,2 x 0,3
= 202,2 x( 10,3 - 10 - 0,3)
= 202,2 x ( 0,3 - 0,3)
= 202,2 x 0
=0
b, 5,8 x 6,3 - 4,9 x 2,6 + 3,7 x 6,3 + 4,9 x 12,6
= ( 5,8 x 6,3 + 3,7 x 6,3) + ( 12,6 x 4,9 - 4,9 x 2,6 )
= 6,3 x ( 5,8 + 3,7) + 4,9 x ( 12,6 - 2,6)
= 6,3 x 9,5 + 4,9 x 10
= 59,85 + 49
= 108,85
b) X x 3,7 + X x 6,3 = 120 |
X x ( 3,7 + 6,3 ) = 120
X x 10 = 120
X = 120 : 10
X = 12
Vậy X = 12
y x 6,3 + y x 3,7 = 100
y x ( 6,3 + 3,7 ) = 100
y x 10 = 100
y = 100 : 10
y = 10
y x 6.3 + y x 3.7=100
y x (6.3+3.7) =100
y x 10 = 100
y =100:10
y =10
6,3 x y + 3,7 x y = 100
(6,3 + 3,7) x y = 100
10 x y = 100
y = 100 : 10
y = 10
7,75 - (0,5 x y : 5 - 6,3) = 1,75
0,5 x y : 5 - 6,2 = 7,75 - 1,75
0,5 x y : 5 - 6,2 = 6
0,5 x y : 5 = 6 + 6,2
0,5 x y : 5 = 12,2
0,5 x y = 12,2 x 5
0,5 x y = 61
y = 61 : 0,5
y = 122
\(6,3\times y+3,7\times y=100\)
\(\Rightarrow y\times\left(6,3+3,7\right)=100\)
\(\Rightarrow y\times10=100\)
\(\Rightarrow y=100:10=10\)
\(7,75-\left(0,5\times y:5-6,2\right)=1,75\)
\(\Rightarrow0,5\times y:5-6,2=7,75-1,75\)
\(\Rightarrow0,5\times y:5-6,2=6\)
\(\Rightarrow0,5\times y:5=6+6,2\)
\(\Rightarrow0,5\times y:5=12,2\)
\(\Rightarrow y:5=12,2:0,5\)
\(\Rightarrow y:5=24,4\)
\(\Rightarrow y=24,4\times5=122\)
đề:..
=(2,5.4).6,953.3,7+69,53.6,3
=69,53.3,7+69,53.6,3
=69,53.(3,7+6,3)
=69,53.10
=695,3
a,Xx3,7+Xx6,3=12,09 X x{3,7+6,3}=12,09 X x 10=12,09 X=12,09:10 X=1,209 b,213,56-1,7x9,3+10,94 =213,56-15,81+10,94 =197,75+10,94 =208,69
Xx ( 1+2,7+6,3)=120
Xx 10= 120
X = 120 : 10 = 12
nhớ tick cho tui nha
= X x ( 3,7 + 6,3 ) = 120
= X x 10 = 120
= X = 120 : 10
= X = 12
hok tốt