问题
解答题
选择合适的方法计算
|
答案
(1)4.96-(1.3+2.96),
=4.96-1.3-2.96,
=4.96-2.96-1.3,
=2-1.3,
=0.7;
(2)5600÷25÷8,
=5600÷(25×8),
=5600÷200,
=28;
(3)1
÷3 4
-3 7
×21 4
,1 3
=1
×3 4
-7 3
×1 4
,7 3
=(1
-3 4
)×1 4
,7 3
=
×3 2
,7 3
=
;7 2
(4)
×4 11
+3 5
×8 11
,4 5
=
×3 11
+4 5
×8 11
,4 5
=(
+3 11
)×8 11
,4 5
=1×
,4 5
=
;4 5
(5)
=x:5 8
,3 5
x÷
=3 5
,5 8
x÷
×3 5
=3 5
×5 8 3 5
x=
;3 8
(6)2x-3.57+1.43=10,
2x-2.14=10,
2x-2.14+2.14=10+2.14,
2x=12.14,
2x÷2=12.14÷2,
x=6.07.