用递等式计算（能巧算的要巧算）．（1）51×13+49×13 （2）6537﹣29×36（3）5930﹣152﹣348 （4）3717÷（152﹣89）
①=②=③= ④= ⑤= ⑥=⑦=⑧= ⑨= ⑩= ．
直接写出得数．+=﹣= 3×=÷=+=÷= 1﹣=×=
直接写出得数．==== 2÷3====
+=﹣=×= 14÷=÷=×=÷= 6×=
直接写得数： 1﹣= 9×=÷2=÷== 1=×1.3=×=
=②
=③
= ④
= 
= ⑥
=⑦
=⑧
= 
= ⑩
= ．
+
=
﹣
=
÷
=
+
=
÷
= 1﹣
=
×
=
=
=
=
=
=
=
=
+
=
﹣
=
= 14÷
=
÷
=
×
=
÷
= 6×
=
= 9×
=
÷2=
÷
= 1
=
×1.3=
×
=
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