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a)\(x\times17,7-7,7\times x=177\)
\(x\times\left(17,7-7,7\right)=177\)
\(x\times10=177\)
\(x=177\div10\)
\(x=17,7\)
b) \(9\times\left(12-2\times x\right)=54\)
\(12-2\times x=54\div9\)
\(12-2\times x=6\)
\(2\times x=12-6\)
\(2\times x=6\)
\(x=6\div2\)
\(x=3\)
c) \(x\times3,9+x\times0,1=16\)
\(x\times\left(3,9+0,1\right)=16\)
\(x\times4=16\)
\(x=16\div4\)
\(x=4\)
a) \(x\times17,7-7,7\times x=177\)
\(x\times\left(17,7-7,7\right)=177\)
\(x\times10=177\)
\(x=177:10\)
\(x=17,7\)
b) \(9\times\left(12-2\times x\right)=54\)
\(12-2\times x=54:9\)
\(12-2\times x=6\)
\(2\times x=12-6\)
\(2\times x=6\)
\(x=6:2\)
\(x=4\)
c) \(x\times3,9+x\times0,1=16\)
\(x\times\left(3,9+0,1\right)=16\)
\(x\times4=16\)
\(x=16:4\)
\(x=4\)
\(#Nulc`\)
a
x * 17,7 - 7,7 * x = 177
x*(17,7-7,7)=177
x*10=177
x=177:10=17,7
B) x * 3,9 + x : 10= 16
x*3,9+x*1/10=16
x*(3,9+1/10)=16
x*4=16
x=16:4=4
C) 1,23 : x - 0,45 : x =15
x*(1,23-0,45)=15
x*0,78=15
x*78/100=15
x=15:78/100=19,23076923...(các bạn tự tính)
Đ) (x - 1/3) * 5/3 = 14/27 - 3/9
(x-1/3)*5/3=5/27
x*1/3=5/27:5/3
x*1/3=1/9
x=1/9:1/3
x=1\3
G) ( 1,2 * 1,5 - x ) * 1/4 = 1,2 * 1,4
(1,2*1,5-x)*1/4=1,68
1,2*1,5-x=1,68:1/4
1,2*1,5-x=6,72
1,8-x=6,72
x=6,72-1,8
x=4,92
h) (84,6 - 2 * x ) : 3,02 = 5,1
(84,6-2 * x)=3,02*5,1
84,6-2*x=15,402
x=84,6-15,402
x*2=69,198
x=69,198:2=34,599
nhớ k cho mình nhá
Lời giải:
$3,8\times 2+1,9\times 8+7,6\times 2-17,7$
$=1,9\times 2\times 2+1,9\times 8+1,9\times 4\times 2-17,7$
$=1,9\times 4+1,9\times 8+1,9\times 8-17,7$
$=1,9\times (4+8+8)-17,7$
$=1,9\times 20-17,7=38-17,7=20,3$
X*17,7-7,7*X=170
X*(17,7-7,7)=170
10X=170
X=17
X:2,37=4,56+8,9
X:2,37=13,46
X=13,46*2,37
X=31,9002
X:3,78-65,82=12,5-8,69
X:3,78-65,82=3,81
X:3,78=3,81+65,82
X:3,78=69,63
X=69,63*3,78
X=263,2014
\(x\times17,7-x\times7,7=177\)
\(\Leftrightarrow x\left(17,7-7,7\right)=177\)
\(\Leftrightarrow10x=177\)
\(\Leftrightarrow x=177\div10\)
\(\Leftrightarrow x=17,7\)
Vậy \(x=17,7\)
x×17,7−x×7,7=177
⇔x(17,7−7,7)=177
⇔10x=177
⇔x=177÷10
⇔x=17,7
Vậy x=17,7