简单的方程

(c)“一个/ 5 + 3 = 2”

答:“一个/ 5 + 3 = 2”

或者,“一个/ 5 = 2 - 3 = 1”

或者,“= 1 xx5 = 5”

(d)“q / 4 + 7 = 5”

答:“q / 4 + 7 = 5”

或者,“q / 4 = 5 - 7 = 2”

或者,“q = 2 xx4 = 8”

(e)“5/2x = 10”

答:“5/2x = 10”

或者,“x = 10 xx2/5 = 4”

(f)“5/2x = (25) / (4) '

答:“5/2x = (25) / (4) '

或者,“x = (25) / (4) xx2/5 = figueres 5/2 = '

(g)“7 m + (19) / (2) = 13 '

答:“7 m + (19) / (2) = 13 '

或者,“7 m = 13——(19)/ (2)'

或者,“7 m = (26-19) / (2) = 7/2 '

或者,“m = 7/2÷7 = 1/2”

(h)“6 z + 10 = 2”

答:“6 z + 10 = 2”

或者,“6 z = 2 - 10 = -12”

或者,z = -(12) /(6) = 2》

(我)' (3 l) /(2) = 2/3的

答:' (3 l) /(2) = 2/3的

或者,“3 l = 2/3xx2 = 4/3”

或者,“l = 4/3÷3 = 4/9”

(j)' (2 b) / (3) xx5 = 3 '

答:' (2 b) / (3) xx5 = 3 '

或者,“(2 b) / (3) = 3/5 '

或者,' b = 3/5xx3/2 = (9) / (10) '

问题2:求解如下方程:

(一)' 2(x + 4) = 12 '

答:' 2(x + 4) = 12 '

或者，' x + 4 = 12 ÷ 2 = 6 '

或者，' x = 6 - 4 = 2 '

(b)' 3(n - 5) = 21 '

答:' 3(n - 5) = 21 '

或者，' n - 6 = 21 ÷ 3 = 7 '

或者，' n = 7 + 6 = 13 '

(c)' 3(n - 5) = - 21 '

答:' 3(n - 5) = - 21 '

或者' n - 5 = - 21 ÷ 3 = - 7 '

或者' n = - 7 + 5 = - 2 '

(d)' - 4(2 + x) = 8 '

答:' - 4(2 + x) = 8 '

或者，' 2 + x = 8 ÷ (- 4) = - 2 '

或者，' x = - 2 - 2 = - 4 '

(e)' 4(2 - x) = 8 '

答:' 4(2 - x) = 8 '

或者，' 2 - x = 8 ÷ 4 = 2 '

或者，' x = 2 - 2 = 0 '

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问题3:求解如下方程:

(一)' 4 = 5(p - 2) '

答:' 4 = 5(p - 2) '

或者，' p - 2 = 4 ÷ 5 = 0.8 '

或者' p = 0.8 + 2 = 2.8 '

(b)' - 4 = 5(p - 2) '

答:' - 4 = 5(p - 2) '

或者，' p - 2 = - 4 ÷ 5 = - 0.8 '

或者' p = - 0.8 + 2 = 1.2 '

(c)' 16 = 4 + 2(t + 2) '

答:' 16 = 4 + 2(t + 2) '

或者，' 2(t + 2) = 16 - 2 = 14 '

或者' t + 2 = 14 ÷ 2 = 7 '

或者，t = 7 - 2 = 5

(d)' 4 + 5(p - 1) = 34 '

答:4 + 5(p - 1) = 34

或者' 5(p - 1) = 34 - 4 = 30 '

或者，' p - 1 = 30 ÷ 5 = 6 '

或者' p = 6 + 1 = 7 '

(e)' 0 = 16 + 4(m - 6) '

答:0 = 16 + 4(m - 6)

或者，' 4 (m - 6) 0 - 16 = - 16 '

或者' m - 6 = - 16 ÷ 4 = - 4 '

或者' m = - 4 + 6 = 2 '

问题4:构造三个以“x = 2”开头的方程

答:' x + 2 = 4 '

“2x + 3 = 7”

“3x - 2 = 4”

质疑5:构造三个以“x = - 2”开头的方程

答:' 2x - 3 = -7 '

' 2x + 4 = 0 '

' 5x + 12 = 0 '

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