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The calculation problem of the mixed operation of addition, subtraction, multiplication and division of rational numbers in grade one is 12.
5.4×3.08+3.6×3.08+3.08

0.25× 1.9×40

〔(6. 1-4.6)×0.8- 1〕×0.4

6.3+0.84+3.7+8. 16

5.4×3.08+3.6×3.08+3.08

0.25× 1.9×40

〔(6. 1-4.6)×0.8- 1〕×0.4

6.3+0.84+3.7+8. 16

7.05×23.7+7.05×76.3

0. 125×3.2×2.5

( 12+23. 1÷0.75)×0.4-5. 12

1.6×[( 12-7.2)÷(0.84÷2. 1)]

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