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98x199用巧算怎么做

原式=98×(200-1) =98×200-98×1 =19600-98 =19600-100+2 =19500+2 =19502

123×199 =123×(200-1) =123×200-123×1 =24600-123 =24477

解: 99×99+199 =99×99+100+99 =99×(99+1)+100 =9900+100 =10000

(200-2+0.2-0.002)x(200-1)-(200-1+0.2-0.001)(200-2) =(200-2)x(200-1)+(0.2-0.002)x(200-1)-(200-1)x(200-2)-(0.2-0.001)x(200-2) =(0.2-0.002)x(200-1)-(0.2-0.001)x(200-2) =(40-0.2-0.4+0.002)-(40-0.4...

( 87.3 × 47.7 - 1.98 ) ÷(4.76×87.4+0.199) =10 ( 87.3 x 4.77 - 0.198 ) ÷ ( 4.76 x 87.4 + 0.199 ) =10 [ 87.3 x ( 4.76 + 0.01 ) - 0.198 ] ÷ [ ( 87.3 + 0.1 ) x 4.76 + 0.199 ] =10 ( 87.3 x 4.76 + 0.873 - 0.2 + 0.002 ) + ( 87.3 x 4....

975×579-198 =(976-1)×(578+1)-198 =976×578+976×1-578×1-1-198 =578×976+976-578-199 =578×976+199 (975×579-198)÷(578×976+199) =(578×976+199)÷(578×976+199) =1

982-199怎么巧算? =982-200+1 =782+1 =783

198x199199一199x198198 =198×(199×1001)-199×(198×1001) =0

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

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