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+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