题目内容

脱式计算,能简算的要简算.
(1)772-317+128×5
(2)(
11
12
-
3
4
)÷(2-
1
2
(3)1.75+6.8+3.2+0.25
(4)17×99+17(5)120÷〔45×(1-
8
9
)〕
(6)86.5-(1.7×6+0.8)
(1)772-317+128×5,
=772-317+640,
=455+640,
=1095;

(2)(
11
12
-
3
4
)÷(2-
1
2
),
=
2
12
÷
3
2

=
1
9


(3)1.75+6.8+3.2+0.25,
=(1.75+0.25)+(6.8+3.2),
=2+10,
=12;

(4)17×99+17,
=17×(99+1),
=17×100,
=1700;

(5)120÷[45×(1-
8
9
)],
=120÷[45×
1
9
],
=120÷5,
=24;

(6)86.5-(1.7×6+0.8),
=86.5-(10.2+0.8),
=86.5-11,
=75.5.
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