49=12P-r
4
9
(11) 5m +4n = 7 [n]
(3) S=re (e)
(15) xy=5:2 (x)
4h=-5m+7
(17) c= 3
2a+b [b]
29-b
3
= C
9=120=+
4
2x=54
29-b=30
-b = 3C-2d
h=
-5m+7
4
l=2ts
x=
PO
b=29-30
(12)
- 3a +86 +12=0 [a]
-3a = -86-12
x=
(14) 5.x-3y = 2x+4y [y]
-7y=3x
y=3x+7
(16) ab=m:n [b]
bm=an
(18) ²(x+2y)=z [y]
号/x+3y=2
3x+1
4
a=
86+12
3
y=3x+グ
39=-22-
y = 22/1/2
b=ano
y = 3/73x2
計算トレーニング
31