300+300-300x300:300=300+300-90000:300=300+300-300=600-300=300
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300+300-300x300:300=300+300-90000:300=300+300-300=600-300=300
x + 300 = 300 + 300
300 + 300
x + 300 = 100 + 300
x + 300 = 300 + 30
300 x 300 =
x + 300 = 500 + 300
Tính nhẩm:
a) 500 + 400 = .......
900 – 400 = .......
900 – 500 = .......
b) 700 + 50 = .......
750 – 50 = .......
750 – 700 = .......
c) 300 + 40 + 6 = .......
300 + 40 = .......
300 + 6 = ......
300+300+200+400+600x2
(300 x 300) x 3 = ?