简便运算54乘7.2加2.8乘31加2.8乘23

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简便运算54乘7.2加2.8乘31加2.8乘23
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简便运算54乘7.2加2.8乘31加2.8乘23
简便运算54乘7.2加2.8乘31加2.8乘23

简便运算54乘7.2加2.8乘31加2.8乘23
=54×7.2+2.8×(31+23)
=54×7.2+2.8×54
=54×(7.2+2.8)
=54×10
=540

54乘7.2加2.8乘31加2.8乘23=54×7.2+2.8×(31+23)
=54×7.2+2.8×54
=54×(7.2+2.8)
=54×10
=540

=54×7.2+2.8×(31+23)
=54×7.2+2.8×54
=54×(7.2+2.8)
=54×10
=540