解方程。 7.8－2.2＋χ=14.24χ－=3 +2χ=
1.8×2.4- 1.8×0.24= 180×2.4= 180×0.24= 0.18×0.24= 0.18×0.24=
x : =:
x - x=18.7
15.8-(6+÷12.5%)
10-÷×1
7.8－2.2＋χ=14.2
=3
+2χ=
=
:
x=18.7
+
÷12.5%)
-
÷
×1
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