99*25.12+25.12等于多少,要简便
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99*25.12+25.12等于多少,要简便
99*25.12+25.12等于多少,要简便
99*25.12+25.12等于多少,要简便
99×25.12+25.12
=(99+1)×25.12
=100×25.12
=2512
=(99+1)*25.12
=100*25.12
=2512
加法分配率(99+1)×25.12=2512
25.12乘20等于502.4 25.12除3.14除2等于4 4乘4乘3.14=50.24 502.4+50.24=552.64单位厘米