Question

Tính nhẩm:

a) 30000 + (20000 + 40000) = ..................

    30000 + 20000 + 40000 = ..................

    60000 - (30000 + 20000) = ..................

    60000 - 30000 - 20000 = ..................

b) 40000 x 2 : 4 = ..................

    36000 : 6 x 3 = ..................

    20000 x 4 : 8 = ..................

    60000 : 3 x 2 = ..................

Answer 1

a) 30000 + (20000 + 40000) = 90000

    30000 + 20000 + 40000 = 90000

    60000 - (30000 + 20000) = 10000

    60000 - 30000 - 20000 = 10000

b) 40000 x 2 : 4 = 20000

    36000 : 6 x 3 = 18000

    20000 x 4 : 8 = 10000

    60000 : 3 x 2 = 18000