Tìm x:
a) – (12 – 5 + 9 – x) = 3-|5- 8 + 2|
b) 14 – (5 – 8 + 3 – x) = |- 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- 8 + 2|
b) 14 – (5 – 8 + 3 – x) = |- 7 + 10|
c) -19 – (3x – 5) = |4 – 15 + 2|
d) 45 – (x + 45 – 3) = |-7 +3|
e) – (- 12 +4 – 10) – (4 – x) = – (- 3)
Đáp án:
Giải thích các bước giải:
a,
`- (12 – 5 + 9 – x) = 3-|5- 8 + 2|`
`<=> -12+5−9+x=3-∣-1∣`
`<=> x-16=3-1`
`<=> x-16=2`
`<=> x=2+16`
`<=> x=18`
b,
`14 – (5 – 8 + 3 – x) = |- 7 + 10|`
`<=> 14-5+8-3+x=∣-7+10∣`
`<=> x+14=∣3∣`
`<=> x+14=3`
`<=> x=3-14`
`<=> x=-11`
c,
`-19 – (3x – 5) = |4 – 15 + 2|`
`<=> -19-3x+5=∣-9∣`
`<=> -3x-14=9`
`<=>-3x=23`
`<=> x=-23/3`
d,
`45 – (x + 45 – 3) = |-7 +3|`
`<=> 45-x-45+3=∣-4∣`
`<=> 3 – x = 4`
`<=>x=3-4`
`<=> x = -1`
e,
`- (- 12 +4 – 10) – (4 – x) = – (- 3)`
`<=> 12-4+10-4+x=3`
`<=> x+14=3`
`<=>x=3-14`
`<=> x=-11`
Giải thích các bước giải:
a) – (12 – 5 + 9 – x) = 3-|5- 8 + 2|
⇔ −12+5−9+x=3−∣5−8+2∣
⇔ −12+5−9+x=3−∣−3+2∣
⇔ −12+5−9+x=3−∣−1∣
⇔ −12+5−9+x=3−1
⇔ x−16=3−1
⇔ x−16=2
⇔ x=2+16
⇔ x=18
·∪·
b) 14 – (5 – 8 + 3 – x) = |- 7 + 10|
⇔ 14−5+8−3+x=∣−7+10∣
⇔ 14−5+8−3+x=∣3∣
⇔ x+14=3
⇔ x=3−14
⇔ x=−11
·∪·
c) -19 – (3x – 5) = |4 – 15 + 2|
⇔ −19−3x+5=∣4−15+2∣
⇔ −19−3x+5=∣−11+2∣
⇔ −19−3x+5=∣−9∣
⇔ −19−3x+5=9
⇔ −3x−14=9
⇔ −3x=9+14
⇔ −3x=23
⇔ x=−$\frac{23}{3}$
·∪·
d) 45 – (x + 45 – 3) = |-7 +3|
⇔ 45−x−45+3=∣−7+3∣
⇔ 45 − x − 45 + 3 = ∣−4∣
⇔ 45 − x − 45 + 3 = 4
⇔ 3 − x = 4
⇔ −x = 4 − 3
⇔ −x = 1
⇔ x = -1
·∪·
e) – (- 12 +4 – 10) – (4 – x) = – (- 3)
⇔ 12−4+10−4+x=3
⇔ x+14=3
⇔ x=3−14
⇔ x=−11
xin hay nhất! :)))