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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

(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...

444x185+777x180=111x4x185+111x7x180=111x(4x185+7x180)=111x(740+1260)=111x2000=222000 198x199199-199x198198=198x199x1001-199x198x1001=199x198x(1001-1001)=0

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

( 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....

=199+25×90-25×1 =199+2250-25 =2250+174 =2424

1.995x34+199.5x0.67-19.95x0.1巧算: 1.995x34+199.5x0.67-19.95x0.1 =1.995x34+1.995x67-1.995x1 =1.995x(34+67-1) =1.995x100 =199.5

982-199怎么巧算? =982-200+1 =782+1 =783

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

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