求下面各比的比值。（1）24：36（2）（3）7.5：4 （4）：50
脱式计算（能简算的要简算）．
直接写出得数．= = = = == = = = == = = = 1﹣1%=
能简便的要用简便方法计算 12÷0.4÷；÷9+×； 1.8×+1.2×﹣．
解方程 X﹣X= 2X+= 70%X+20%X=3.6．
直接写出得数÷= ×=×=÷=﹣= ÷6= 0.64×=+=+= 18﹣= 1÷= 75%÷3=
：50
．
= 
= 
= 
= 
=
= 
= 
= 
= 
=
= 
= 
= 
= 1﹣1%=
；
÷9+
×
+1.2×
X=
2X+
=
70%X+20%X=3.6．
÷
= 
×
=
×
=
÷
﹣
= 
÷6= 0.64×
=
+
=
+
= 18﹣
= 1÷
= 75%÷3=
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