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    精英家教网 > 小学数学 > 题目详情

    8×4=12×3=
    80×4=120×3=
    8×40=12×30=
    80×40=120×30=
    800×40=1200×30=

    解：8×4=3212×3=36
    80×4=320120×3=360
    8×40=32012×30=360
    80×40=3200120×30=3600
    800×40=320001200×30=36000

    分析：根据因数与积的变化规律，一个因数不变，另一个因数扩大（或缩小）几倍，积也就扩大（或缩小）相同的倍数．
    点评：此题主要考查乘法算式中两个因数的变化引起积的变化规律，要注意根据题意灵活解答．
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