（1）学校饲养了84只兔子，白兔和黑兔的只数比是3：4，白兔和黑兔分别有多少只？（2）学校饲养了84只白兔，白兔和黑兔的只数比是3：4，黑兔有多少只？
直接写得数 30﹣19.02= 1﹣0.94+0.06= 3.125+1= 1×5÷×= 1÷0.1﹣1×0.1= 12×3.14﹣6.28=++=×0.25+3=
直接写得数 4.3+3.57= 6.3÷0.9= 2.4×0.5= 1÷0.2÷0.5= 5﹣﹣= 10÷10%= 1÷0.2÷0.5= 7×÷7×=
直接写得数 24÷=﹣= 10+2.52=（﹣0.5）×=×=（+）×12=×÷×= 0.32×200=
计算下面各题．====+=====
口算：========
= 1×5÷
×=
++
=
×0.25+3== 1×5÷×=++=×0.25+3=
﹣
= 10÷10%= 1÷0.2÷0.5= 7×
÷7×
=
﹣
= 10+2.52=（
=
×
=（
+
）×12=
÷
×
=
=
=
=
+
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