第50页

信息发布者：
25
×
17
+
25
×
4
37
99
+
1
=25×30+25×4
=750+100
=850
=14×100+14×2
=1400+28
=1428
=15×(120+80)
=15×200
=3000
=67×(99+1)
=67×100
=6700
=300×21+3×21
=6300+63
=6363
=15×(24+76)
=15×100
=1500
=40×30+40×25
=1200+1000
=2200
=18×300+18
=5400+18
=5418
=7×(43+47)
=7×90
=630
148
2600
148
2600
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