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脱式计算(能简算的,要简算) (2/5加1/3)乘以15 8/9乘2

2.4×3.5+6.5×1.5 =2.4×(2+1.5)+6.5×1.5 =4.8+2.4×1.5+6.5×1.5 =4.8+1.5×(2.4+6.5) =4.8+1.5×(9-0.1) =4.8+1.5×9-0.15 =4.8+13.5-0.15 =18.3-0.15 =18.15

答案是:119,1486,184,18,691,24

(4/5-8/15×1/2)÷3/5 =(4/5-4/15)÷3/5 =8/15÷3/5 =8/9

1/6+1/3+1/2 =1/6+2/6+3/6 =1 8/15+(7/30-1/5) =16/30+7/30-6/30 =17/30 6/7-(1/7+1/2) =6/7-1/7-1/2 =12/14-2/14-7/14 =2/14 9/10-(1/4-1/6) =9/10-1/4+1/6 =54/60-15/60+10/60 =49/60

(1) 4 5 - 4 5 ÷ 2 3 × 1 2 = 4 5 - 4 5 × 3 2 × 1 2 = 4 5 - 3 5 = 1 5 ;(2)( 2 3 + 4 15 )×15= 14 15 ×15=14;(3)12.87+3.65+1.35=12.87+(3.65+1.35)=12.87+5=17.87;(4)74.6×19+19×25.4=(74.6+25.4)×19=100×19=1900;(5)【...

1/6+1/5+1/2 =5/30+6/30+15/30 =11/30+15/30 =13/15

(4/5-8/15)×1/2÷3/5 =4/15×1/2÷3/5 =2/15÷3/5 =2/9

6.5X2.3+6.7X6.5 =6.5X(2.3+6.7) =6.5X9 =58.5

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