Tìm x:
a) – (12 – 5 + 9 – x) = 3-|5- 9+ 2|
b) 14 – (5 – 8 + 3) = |- 7 + 10|
c) -19 – (3x – 5) = |4 – 15 + 2|
d) 45 – (x + 45 – 3) = |-7 +3|
e) – (- 12 +4 – 10) – (4 – x) = -(- 3)
Tìm x: a) – (12 – 5 + 9 – x) = 3-|5- 9+ 2| b) 14 – (5 – 8 + 3) = |- 7 + 10| c) -19 – (3x – 5) = |4 – 15 + 2| d) 45 – (x + 45 – 3) = |-7 +3| e) – (-
By Aubrey
a)-(12-5+9-x)=3-|5-9+2|
⇔-(16-x)=3-|-2|
⇔-16+x=3-2
⇔-16+x=1
⇔x=1+16
⇔x=17
b)14-(5-8+3-x)=|-7+10|
⇔14-(-x)=|3|
⇔14+x=3
⇔x=3-14
⇔x=-11
c) -19-(3x-5)=|4-15+2|
⇔-19-(3x-5)=|-9|
⇔-19-(3x-5)=9
⇔3x-5=-19-9
⇔3x-5==-28
⇔3x=-28+5
⇔3x=-23
⇔x=$\frac{-23}{3}$
d) 45-(x+45-3)=|-7+3|
⇔45-(x+45-3)=|-4|
⇔45-(x+45-3)=4
⇔x+45-3=45-4
⇔x+45-3=41
⇔x+45=41+3
⇔x+45=44
⇔x=44-45
⇔x=-1
e)-(-12+4-10)-(4-x)=-(-3)
⇔18-4+x=3
⇔14+x=3
⇔x=3-14
⇔x=-11
CHÚC BN HỌC TỐT
Đáp án:
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Giải thích các bước giải:
a) – (12 – 5 + 9 – x) = 3-|5- 9+ 2|
-12+5-9-x=3-| -2 |
-x= 3-2+12-5+9
-x = 17
-x= -17
b) 14 – (5 – 8 + 3 – x) = |- 7 + 10|
14-5+8-3+x = | 3 |
x = 3-14+5-8+3
x = -11
c) -19 – (3x – 5) = |4 – 15 + 2|
-19-3x+5= | -9 |
-3x= 9+19-5
-3x = 23
x= 23 : (-3)
x= -23/3
d) 45 – (x + 45 – 3) = |-7 +3|
45 -x-45+3= | -4 |
-x= 4-3-45+45
-x= 1
x= -1
e) – (- 12 +4 – 10) – (4 – x) = -(- 3)
12-4+10-4+x = 3
x = 3-12+4-10+4
x = -11
CHO MÌNH XIN HAY NHẤT Ạ!