28+72×3的简便计算
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28+72×3的简便计算28+72×3的简便计算28+72×3的简便计算28+72×3=28+72+72×2=100+144=24430+70*3+6-228+72+2x72=100+14428+72
28+72×3的简便计算
28+72×3的简便计算
28+72×3的简便计算
28+72×3
=28+72+72×2
=100+144
=244
30+70*3+6-2
28+72+2x72=100+144
28+72×3=28+72+2x72=100+144 =244
28+72*3=28+28*3*3=28*(1+9)
28+72×3
=28+72+72×2
=100+144
=244