简便计算.
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(1)101×78, =(100+1)×78, =100×78+78, =7800+78, =7878; (2)25×88, =25×(4×22), =(25×4)×22, =100×22, =2200; (3)99×76+76, =(99+1)×76, =100×76, =7600; (4)5×38×4×5, =(5×5×4)×38, =100×38, =3800; (5)(25+20)×4, =25×4+20×4, =100+80, =180; (6)35×103-3×35, =(103-3)×35, =100×35, =3500. |
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a.12×(4+25)[ ]
a. 47+(14×5)(1)35+65=
65+35=
35+65○65+35