问题 解答题

(1)60.28+0.72×4.3

(2)6.37-0.37×16

(3)3.8×99

(4)2.5×9×0.4×1.1

(5)2.6×(10.6-9.72)

(6)1.25×888.

答案

(1)60.28+0.72×4.3,

=60.28+3.096,

=63.376;

(2)6.37-0.37×16,

=6.37-5.92,

=0.45;

(3)3.8×99,

=3.8×(100-1),

=3.8×100-3.8×1,

=380-3.8,

=376.2;

(4)2.5×9×0.4×1.1,

=(2.5×0.4)×(9×1.1),

=1×9.9,

=9.9;

(5)2.6×(10.6-9.72),

=2.6×0.88,

=2.288;

(6)1.25×888,

=1.25×(8×111),

=(1.25×8)×111,

=10×111,

=1110.

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