用简便方法计算. (8+40)×25 (125×25)×(8×4) 34×102 72×125.
(1)(8+40)×25, =8×25+40×25, =200+1000, =1200; (2)(125×25)×(8×4), =(125×8)×(25×4), =1000×100, =100000; (3)34×102, =34×100+34×2, =3400+68, =3468; (4)72×125, =9×(8×125), =9×1000, =9000. |
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