问题 解答题
脱式计算(能简算要简算)
(1)(66-32×1.2)÷0.25(2)10×
3
4
+17×75%-7×0.75
(3)0.25×(5
1
5
(3-2.5×
7
8
))
(4)9.99×22.2+33.3×3.34.
答案

(1)(66-32×1.2)÷0.25,

=(66-38.4)÷0.25,

=27.6÷0.25,

=110.4,

(2)10×

3
4
+17×75%-7×0.75,

=10×0.75+17×0.75-7×0.75,

=(10+17-7)×0.75,

=20×0.75,

=15,

(3)0.25×[5

1
5
×(3-2.5×
7
8
)],

=0.25×[5

1
5
×(3-
35
16
)],

=0.25×[5

1
5
×
13
16
],

=

1
4
×
26
5
×
13
16

=1

9
160

(4)9.99×22.2+33.3×3.34,

=9.99×11.1×2+11.1×3×3.34,

=11.1×(9.99×2+3×3.34),

=11.1×(19.98+10.02),

=11.1×30,

=333.

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