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| (1)101×47, =100×47+1×47, =4700+47, =4747; (2)125×25×8, =(125×8)×25, =1000×25, =25000; (3)99×37, =(100-1)×37, =100-37-1×37, =3700-37, =3663; (4)428+257-(157+38), =428+(257-157-38), =428+62, =490; (5)101×101-101, =101×(101-1), =101×100, =10100. |
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a.12×(4+25)[ ]
a. 47+(14×5)(1)35+65=
65+35=
35+65○65+35