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a/
3/4 . x = 1
=> x= 1: 3/4 = 4/3
b/
4/7 .x = 9/8 -0,125 = 9/8 -1/8 = 1
=> x= 1 : 4/7 = 7/4
a/ 3/4x=1
x=1:3/4
x=4/3
b/ 4/7x=9/8-0,125
4/7x=1
x=1:4/7
x=7/4
Lời giải:
a)
\(\frac{3}{4}x=1\)
\(x=1:\frac{3}{4}=1.\frac{4}{3}=\frac{4}{3}\)
b)
\(\frac{4}{7}x=\frac{9}{8}-0,125\)
\(\frac{4}{7}x=1\)
\(x=1:\frac{4}{7}\)
\(x=\frac{7}{4}\)
a) 3/4x = 1
x = 1 : 3/4
x = 4/3
b) 4/7x = 9/8 - 0,125
4/7x = 1
x = 1 : 4/7
x = 7/4
*4/7x=9/8.0,125
4/7x=9/8.1/8
4/7x=9/64
x =9/64:4/7
x =9/64.7/4
x =63/256
*x-25%=1/2
x-1/4.x =1/2
x(1-1/4) =1/2
3/4.x =1/2
x =1/2:3/4
x =1/2.4/3
x =2/3
⇔(2 x ) 2+2.2 x .1+1 2=0 ... c ,(3 x −4) 2−14(3 x −4)(6+3 x )+49(3 x +6)=16 ... ⇔9 x 2−24 x +16−126 x 2−252 x +168 x +336+147 x +294=16.
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4/7x = 9/8 - 0,125
4/7x = 9/8 - 1/8
4/7x = 1
x = 1 : 4/7
x = 7/4
=^_^=
k mình nha
\(\frac{4}{7}x=\frac{9}{8}-0,125\)
\(\frac{4}{7}x=\frac{9}{8}-\frac{1}{8}\)
\(\frac{4}{7}x=\frac{8}{8}\)
\(\frac{4}{7}x=1\)
\(x=1:\frac{4}{7}\)
\(x=1\times\frac{7}{4}\)
\(x=\frac{7}{4}\)
\(a,-5.\left(-x+7\right)-3.\left(-x-5\right)=-4.\left(12-x\right)+48\)
\(5x-35-3x+15=-48+4x+48\)
\(2x-10=4x\)
\(2x-4x=10\)
\(-2x=10\)
\(x=-5\)
\(b,\left(-x-7\right)-5.\left(-x-3\right)=12.\left(3-x\right)\)
\(-x-7+5x+15=36-12x\)
\(4x+8=36-12x\)
\(4x+12x=36-8\)
\(16x=28\)
\(x=1,75\)
các câu còn lại tương tự nha
3/ 4x=1 <=>x=1/4
4/7x=9/8-0,125 <=>7x=1<=>x=1/7
3/4x=1
<=>x=4/3
4/7x=9/8-0,125
<=>4/7x=9/8-1/8=8/8=1
<=>x=7/4