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42 98x21简便计算

98x21的简易算法是什么样的回答:98×21 =(100-2)×21 =2100-42 =2058

42x21/42x21用简便方法计算42x21/42x21 =21x42/42x21 =21x21 =(20+1)x(20+1)=441 如有帮助请采纳,如对本题有疑问可追问,Good luck!

42x78十42x21十42简便计算42x78十42x21十42简便计算 =42x(78+21+1)=42x100 =4200

42x76+43+42x21怎么简便运算?=42×(76+1+21)+1 =42×98+1 =42×(100-2)+1 =42×100-42×2+1 =4200-84+1 =4117

42x98-42x2+42x4的简便运算是多少?都是42与一个数字的相乘的加减法,可以先算加减再相乘:42*98-42*2+42*4@=42*(98-2+4)=42*100=4200

198x21x79x98怎么样简便计算?198x21x79x98这个算式的简便计算,具体的操作过程如下:198x21x79x98 =(100+98)x21x79x98 =100x21+21x98x79x98 =(21+78)

19X21+79X21的简便计算21×(19+79) =21×98 =21×(100-2) =21x100-21×2 =2100-42 =2058 望采纳谢谢!

简便计算21x57 42x21回答:21X57+42X21 =21X(57+42) =21X99 =21X100-21X1 =2100-21 =2079

用简便方法计算102x21102x21 =(100+2)x21 =(100x21)+(2x21)=2100+42 =2142

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