计算．（1）64+4×7 （2）854÷（55﹣48）（3）（49+23）×4．
直接写出得数．+=+=﹣= 15﹣=
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口算高速直达.+=+= 0.32=+2=+﹣+=﹣0.25=+= 12.5×8= 2﹣﹣=﹣+=
直接写出得数．+= 1﹣= 0.32= 1﹣+=+= 5﹣=﹣= 0.75+=
直接写出得数． 3.6+2=﹣0.4=+0.3=+0.25=﹣0.375=﹣0.3=
+
=
+
=
﹣
= 15﹣
=
=
=
=
=
=
=
=
=
+
=
+
= 0.32=
+2=
+
﹣
=
﹣0.25=
+
= 12.5×8= 2﹣
﹣
=
﹣
+
=
+
= 1﹣
= 0.32= 1﹣
+
=
+
= 5﹣
=
﹣
= 0.75+
=
=
﹣0.4=
+0.3=
+0.25=
﹣0.375=
﹣0.3=
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