1.19+3.1+0.81+6.9
125×124×8
186×101-186
400-(1300÷65+35)
(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.
1.19+3.1+0.81+6.9
125×124×8
186×101-186
400-(1300÷65+35)
(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.