在方框里填上合适的数.
(1)47×80
=(40+7)×80
=40×80+7×80
=3200+560
=3760;
(2)67×50
=(60+7)×50
=60×50+7×50
=3000+350
=3350;
(3)76×52
=76×(50+2)
=76×50+76×2
=3800+152
=3952;
(4)48×98
=48×(100-2)
=48×100-48×2
=4800-96
=4704.
故答案为:(1)560,3760;
(2)3000,3350;
(3)2,76,2,3800,152,3952;
(4)2,4800,96,4704.
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