下面各题怎样算简便就怎样算. 149+587+51 85× 3 4 +15×75% 2.7÷(4-82%-18%)
下面各题怎样算简便就怎样算.149+587+5185×34+15×75%2.7÷(4-82%-18%)517÷9+19×1217(1112-34)÷(2-12)34-0....
下面各题怎样算简便就怎样算. 149+587+51 85× 3 4 +15×75% 2.7÷(4-82%-18%) 5 17 ÷9+ 1 9 × 12 17 ( 11 12 - 3 4 )÷(2- 1 2 ) 3 4 -0.85+25%
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(1)149+587+51, =149+51+587, =200+587, =787; (2)85×
=(85+15)×75%, =100×75%, =75; (3)2.7÷(4-82%-18%), =2.7÷[4-(82%+18%)], =2.7÷[4-1], =2.7÷3, =0.9; (4)
=(
=1×
=
(5)(
=
=
(6)
=
=1-0.85, =0.15. |
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