45X21-50-2.1

45X21-50-2.1

简便计算45X21一50X2、1 -
=45X21一5X21 =（45-5）×21 =40×21 =840
原式=45x21-5x21=40x21=820
45✘31-50✘2.1的简便方法? -
45✘31-50✘2.1 =（40+5）x31-5x10x2.1 =40x31+5x31-5x21 =1240+5x（31-21）1240+5x10 =1240+50 =1290
（5*21）（45*2.1）（50*2.1）（45*2.1）（50-45）2.1 =5*2.1 =10.5
50简便计算(有答案) -
2.34×11-117×0.22 =（2.34×50）×（11÷50）117×0.22 =117×0.22-117×0.22 =0 19.99×19.98-19.97×19.96 =19.99×（19.97+0.01）19.97×19.96 =19.97×0.03+0.1999 =0.799 199.199×198-198.198×199 =199.199×198-198.198×（198+1）199.199-198是什么。.
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求五年级上册脱式计算题50道 一定要过程 -
112x114 221x445 335x21 445x135 112x365 113x141 126x52 126x54 12x456 13x524 13x524 13x658 OK 五年级上册口算题10道和脱式计算题3道5.6+9.5= 10.6-5.96= 1.3*6.3= 2.5*69= 5.13+0.45= 8-1.85= 6.56+13.4= 12.5-0.95= 15-3.8= 6.46-5.9= 12.83+2.25+1.75+6.17 1.27+3.9+0.73+16.1 23等会说。.
五年级上册，小数乘法和小数除法：0.5×4÷0.5×4= 72-3.6÷0.4= 9.5+0.5×2= 15.8-6.8+3.2= 5.4+4.6-2.8= 9-3.2-0.8= (1.5+2.4)×0.2= 1.7+1.3×0.4= 3.6×2-3.6= 8.5÷0.5+0.6= 9.8×[2.5-(0.95+1.3)]= 5.04÷(1.37+0.23+1到此结束了？。.

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