问题
解答题
计算. (1)55×66÷(11×11) (2)40.2-4÷80×2.4 (3)3.5×[6.8-(1.6+3.6÷0.9)]÷84 (4)
(5)(
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答案
(1)55×66÷(11×11),
=55×66÷11÷11,
=55÷11×(66÷11),
=5×6,
=30;
(2)40.2-4÷80×2.4,
=40.2-0.05×2.4,
=40.2-0.12,
=40.08;
(3)3.5×[6.8-(1.6+3.6÷0.9)]÷84,
=3.5×[6.8-(1.6+4)]÷84,
=3.5×[6.8-5.6]÷84,
=3.5×1.2÷84,
=4.2÷84,
=0.05;
(4)
×[1 8
÷(1 2
×3 5
)],10 9
=
×[1 8
÷1 2
],2 3
=
×[1 8
×1 2
],3 2
=
×1 8
,3 4
=
;3 32
(5))(
+1 2
)÷(1 4
÷4-4 5
),1 10
=
÷(3 4
×4 5
-1 4
),1 10
=
÷(3 4
-1 5
),1 10
=
÷3 4
,1 10
=
×10,3 4
=
.15 2