（-4）×（-9）= ．

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Worked solution

1. 确定积的符号并计算绝对值的乘积

根据有理数的乘法法则，“同号得正，并把绝对值相乘”，可得：
(−4)×(−9)=+(∣−4∣×∣−9∣)=4×9=36\left(-4\right) \times \left(-9\right) = +\left(|-4| \times |-9|\right) = 4 \times 9 = 36

Answer

36

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