三年级有男生267人，女生233人，已经参观过博物馆的有398人，还没有参观过的有几人？
你能直接写出下列各题的结果吗？试试看×=÷=××= 4.5%=×12=÷4= （+）×== %
计算．×÷÷××÷6×÷7÷．
直接写得数．= 24÷======
直接写出得数． 12×=÷= 0÷=﹣= 12×（×）=×=÷= 20÷=+=×90×=
直接写出得数：×12= 1÷=×=+=÷2= 6﹣= 0÷=×=÷=﹣=
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÷6×
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= 24÷
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= 20÷
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×90×
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×12= 1÷
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×
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