31.8×7.9-2.5×210%+44.3×2.1的简便计算方法
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31.8×7.9-2.5×210%+44.3×2.1的简便计算方法
31.8×7.9-2.5×210%+44.3×2.1
=31.8×7.9+44.3×2.1-2.5×2.1
=31.8×7.9+（44.3-2.5）×2.1
=31.8×7.9+41.8×2.1
=31.8×7.9+31.8×2.1+10×2.1
=31.8×（7.9+2.1）+21
=31.8×10+21
=318+21
=339
31.8×7.9-2.5×210%+44.3×2.1
=31.8×7.9+44.3×2.1-2.5×2.1
=31.8×7.9+（44.3-2.5）×2.1
=31.8×7.9+41.8×2.1
=31.8×7.9+31.8×2.1+10×2.1
=31.8×（7.9+2.1）+21
=31.8×10+21
=318+21
=339
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