脱式计算:(1) 92×0.54+4 3 5 ×9 1 5 (2) 4.75×1.36×0.375÷(4 3 4
脱式计算:(1)92×0.54+435×915(2)4.75×1.36×0.375÷(434×1925×38)(3)13×5+15×7+17×9+19×11+111×13...
脱式计算:(1) 92×0.54+4 3 5 ×9 1 5 (2) 4.75×1.36×0.375÷(4 3 4 ×1 9 25 × 3 8 ) (3) 1 3×5 + 1 5×7 + 1 7×9 + 1 9×11 + 1 11×13 (4) 567+345×566 567×345+222 .
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驚嘆302
2014-12-25
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(1) 92×0.54+4 ×9 , =9.2×5.4+4.6×9.2, =9.2×(5.4+4.6), =9.2×10, =92;
(2) 4.75×1.36×0.375÷(4 ×1 × ) , =(4.75×1.36×0.375)÷(4.75×1.36×0.375), =1;
(3) + + + + , =( - )× +( - )× +( + )× +( - )× +( - )× , =( - + - + + + - + - )× , =( - )× , = × , = ;
(4) , = 567+345×(567-1) | 567×345+222 | , = 567+345×567-345 | 567×345+222 | , = , =1. |
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