| 选择适合你的方法计算,并写出计算过程. (1)(125+19)×8 (2)666-(309+266) (3)75×2×7×4 (4)125×(800-8) (5)24×24+76×24 (6)5000-666÷37×34 (7)29×75+72×75-75 (8)7800÷[300+5×(66+134)]. |
| (1)(125+19)×8, =125×8+19×8, =1000+152, =1152; (2)666-(309+266), =666-266-309, =400-309, =91; (3)75×2×7×4, =(75×4)×(2×7), =300×14, =4200; (4)125×(800-8), =125×800-125×8, =100000-1000, =99000; (5)24×24+76×24, =(24+76)×24, =100×24, =2400; (6)5000-666÷37×34, =5000-18×34, =5000-612, =4388; (7)29×75+72×75-75, =(29+72-1)×75, =100×75, =7500; (8)7800÷[300+5×(66+134)], =7800÷[300+5×200], =78000÷1300, =60. |
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