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| (1)355+260+140+245, =(355+245)+(260+140), =600+400, =1000; (2)102×99, =(100+2)×99, =100×99+2×99, =9900+198, =10098; (3)98×34, =(100-2)×34, =100×34-2×34, =3400-68, =3332; (4)645-180-245, =645-245-180, =400-180, =220; (5)382×101-382, =382×(101-1), =382×100, =38200; (6)4×60×50×8, =(4×50)×(60×8), =200×480, =96000; (7)35×8+35×6-4×35, =35×(8+6-4), =35×10, =350. |
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a.12×(4+25)[ ]
a. 47+(14×5)(1)35+65=
65+35=
35+65○65+35