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199+99x199的简便计算

199+99×199 =199×(1+99) =199×100 =19900

199+99×199 =199×(99+1) =199×100 =19900 (74+16)×23-90×21 =90×23-1890 =2070-1890 =180

(100-1)x199=19900-199=19701或99x(200-1)=99x200-99=19800-99=19701

99乘199怎么简便计算 解:原式=99×199 =(100-1)×199 =100×199-1×199 =19900-199 =19701 用乘法分配律

5x19.99+16x1.999+0.34x199.9 =19.99×(5+1.6+3.4) =19.99×1 =19.99

199.199×198--198.198×199 =199×1.001×198-198×1.001×199 =0

99x199+99 =99x(199+1) =99x200 =19800

99.9×0.28-0.666×37 =0.333×300×0.28-0.333×2×37 =0.333×(300×0.28-2×37) =0.333×(84-74) =0.333×10 =3.33 2000x199.9-1999x199.8 =2000x(199.8+0.1)-(2000-1)x199.8 =2000x199.8+2000x0.1-2000x199.8+199.8 =(2000x199.8-2000x199.8)+2000x0.1+...

(1)=199*(1+99) =1999*100 =19900 (2)328*(57+43-1) =328*100-328 =32800-328 =32478 (3)=8*125+8*12 =1000+96 =1096

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