脱式计算,能简算的要简算:9.34-(2.34+0.49)815×9-215÷19(0.8-0.91÷2.6)×2.8 ...

2024-12-16 18:19:02
推荐回答(1个)
回答1:

(1)9.34-(2.34+0.49)
=9.34-2.34-0.49
=7-0.49
=6.51;

(2)

8
15
×9-
2
15
÷
1
9

=
8
15
×9-
2
15
×9
=(
8
15
-
2
15
)×9
=
2
5
×9
=3.6;

(3)(0.8-0.91÷2.6)×2.8  
=(0.8-0.35)×2.8
=0.45×2.8
=1.26;
      
(4)3060÷15-2.5×1.04
=204-2.6
=201.4.