问题 解答题
脱式计算(能简算的要简算)
2.5×7.1×4 16.12×99+16.12
5.2×0.9+0.9×4.8[113-(34.15+38.25)]÷2
3.6÷(1.2+0.6)×0.54.82÷0.25+1.25÷0.25.
答案

(1)2.5×7.1×4,

=(2.5×4)×7.1,

=10×7.1,

=71;

(2)16.12×99+16.12,

=16.12×(99+1),

=16.12×100,

=1612;

(3)5.2×0.9+0.9×4.8,

=0.9×(5.2+4.8),

=0.9×10,

=9;

(4)[113-(34.15+38.25)]÷2,

=[113-72.4]÷2,

=40.6÷2,

=20.3;

(5)3.6÷(1.2+0.6)×0.5,

=3.6÷1.8×0.5,

=2×0.5,

=1;

(6)4.82÷0.25+1.25÷0.25,

=4.82×4+1.25×4,

=19.28+5,

=24.28.

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