问题 解答题
8+2-8+225×4÷25×4
1
5
×5÷
1
5
×5
26-0.75+0.25
7.26-(5.26-1.5)286+198314-202526+301
223-996.25+3.85-2.125+3.8759-24÷56×2198×58+58+58.
答案

(1)8+2-8+2,

=10-8+2,

=2+2,

=4;

(2)25×4÷25×4,

=100÷25×4,

=4×4,

=16;

(3)

1
5
×5÷
1
5
×5,

=1÷

1
5
×5,

=5×5,

=25;

(4)26-0.75+0.25,

=25.25+0.25,

=25.5;

(5)7.26-(5.26-1.5),

=7.26-5.26+1.5,

=22+1.5,

=23.5;

(6)286+198,

=286+200-2,

=486-2,

=484;

(7)314-202,

=314-200-2,

=114-2,

=112;

(8)526+301,

=526+300+1,

=826+1,

=827;

(9)223-99,

=223-100+1,

=123+1,

=124;

(10)6.25+3.85-2.125+3.875,

=10.1-2.125+3.875,

=7.975+3.875,

=11.85;

(11)9-24÷56×21,

=9-

3
7
×21,

=9-9,

=0;

(12)98×58+58+58,

=(98+1+1)×58,

=100×58,

=5800.

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