84*0.25+2.5*16 简便计算

84*0.25+2.5*16 简便计算
84*0.25+2.5*16 简便计算

84*0.25+2.5*16 简便计算
84×0.25+2.5×16
=（21×4）×0.25+（4×4）×2.5
=21×（4×0.25）+4×（4×2.5）
=21×1+4×10
=21+40
=61

84*0.25+2.5*16 简便计算
=（84+160）×0.25
=244×(1/4)
=61;
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84*0.25+2.5*16
=21*(4x0.25)+(2.5x4)x4
=21*1+10*4
=21+40
=61

84*0.25+2.5*16
=21*(4x0.25)+(2.5x4)x4
=21*1+10*4
=21+40
=61
肯定对 望采纳