计算下面各题，能简便的要简便计算．
4.5+7.8×2.5÷1.3 75×60%+4×
+0.6 3×（
+
）﹣
3.4×99+3.4
12.5×3.2×2.5 12×（
+
﹣
） 
﹣
x=
x：
=36：18．
计算下面各题，能简便的要简便计算．
4.5+7.8×2.5÷1.3 75×60%+4×+0.6 3×（+）﹣ 3.4×99+3.4
12.5×3.2×2.5 12×（+﹣） ﹣x= x：=36：18．
=
÷
= 0÷
=
﹣
= 12×（
×
×
=
÷
= 20÷
=
+
=
×90×
=
×12= 1÷
=
×
=
+
=
÷2=
=
×
=
÷
=
﹣
=
表示 ；
表示 ．
÷
=
×3= 6×
=
+
×7=
÷1=
÷7=
=
=
=
=
=
）×12=
=
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