问题 解答题

1.19+3.1+0.81+6.9

125×124×8

186×101-186

400-(1300÷65+35)

答案

(1)1.19+3.1+0.81+6.9

=(1.19+0.81)+(3.1+6.9)

=2+10

=12;

(2)125×124×8

=125×8×124

=1000×124

=124000;

(3)186×101-186

=186×(101-1)

=186×100

=18600;

(4)400-(1300÷65+35)

=400-(20+35)

=400-55

=345.

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