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198x0.51=简便运算

198×0.51 =(200-2)x0.51 =200x0.51-2x0.51 =102-1.02 =100.98 谢谢,请采纳

先乘.05得99,再加上乘0.01可得为100.98

200×0.51-2×0.51

0.51x198 =0.51x(200-2) =0.51x200-0.51x2 =102-1.02 =100.98

加法运算定律的简便运算题(一) 1) 500+(407+0)= 2) 386+382+114= 3) 42+(91+158+109)= 4) (87+103+113)+97= 5) (246+387+154)+13= 6) 49+(71+151+129)= 7) 255+(79+45)= 8) (169+39+131)+261= 9) 219+175+181+225= 10) 14+498+486= 11) (404+195...

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