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题型:填空题 题类:常考题 难易度:容易
万以内加、减法口算 2833 10
60+700=
800+500=
550-60 = 420-20= 120-60 = 230+90 = 600+300=
9×4 = 6×7 = 30÷5 = 19÷3 = 15÷4=
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