(1.5+4.5+11.5)乘以2简便运算

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(1.5+4.5+11.5)乘以2简便运算(1.5+4.5+11.5)乘以2简便运算(1.5+4.5+11.5)乘以2简便运算(1.5+4.5+11.5)乘以2=3+9+23=12+23=35

(1.5+4.5+11.5)乘以2简便运算
(1.5+4.5+11.5)乘以2简便运算

(1.5+4.5+11.5)乘以2简便运算
(1.5+4.5+11.5)乘以2
=3+9+23
=12+23
=35