Toán Lớp 5: 3. Tính bằng cách hợp lí:
a) 25 – 2,5 x 2 – 3 x 2,5 – 2,5 b) 2,5 x 3 + 4 x 2,5 + 7,5
4. Tìm x:
a) x x 5,6 + x + x = 27,52 b) x x 3 + x x 6 + x = 90
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