7.2*5.8+0.72*42简便运算高手请帮帮忙
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7.2*5.8+0.72*42简便运算高手请帮帮忙7.2*5.8+0.72*42简便运算高手请帮帮忙7.2*5.8+0.72*42简便运算高手请帮帮忙=7.2*5.8+7.2*4.2=7.2（5.8+
7.2*5.8+0.72*42简便运算高手请帮帮忙
7.2*5.8+0.72*42简便运算高手请帮帮忙
7.2*5.8+0.72*42简便运算高手请帮帮忙
=7.2*5.8+7.2*4.2
=7.2（5.8+4.2）
7.2*5.8+0.72*42简便运算高手请帮帮忙
=7.2×5.8+7.2×4.2
=7.2×（5.8+4.2）
=7.2×10
=72
0.72×10×5.8+0.72×42
=0.72×58+0.72×42
=0.72×(58+42)
=0.72×100
=72
7.2×5.8+0.72×42=7.2×5.8+7.2×4.2=7.2×（5.8+4.2）=7.2×10=72
(7.2*5.8)+(5.8*42)
等于，7.2×5.8+7.2×42=7.2×10=72