计算下面各题,怎样简便就怎样算.125-25×5÷25 75+3.2+4.8+25 &...
计算下面各题,怎样简便就怎样算.125-25×5÷2575+3.2+4.8+2569.2-6.83-3.17125×32400-(32×8+143)68×28+32×28...
计算下面各题,怎样简便就怎样算.125-25×5÷25 75+3.2+4.8+25 69.2-6.83-3.17125×32 400-(32×8+143)68×28+32×28
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(1)125-25×5÷25
=125-125÷25
=125-5
=120;
(2)75+3.2+4.8+25
=75+25+(3.2+4.8)
=100+8
=108;
(3)69.2-6.83-3.17
=69.2-(6.83+3.17)
=69.2-10
=59.2;
(4)125×32
=125×8×4
=1000×4
=4000;
(5)400-(32×8+143)
=400-(256+143)
=400-399
=1;
(6)68×28+32×28
=(68+32)×28
=100×28
=2800.
=125-125÷25
=125-5
=120;
(2)75+3.2+4.8+25
=75+25+(3.2+4.8)
=100+8
=108;
(3)69.2-6.83-3.17
=69.2-(6.83+3.17)
=69.2-10
=59.2;
(4)125×32
=125×8×4
=1000×4
=4000;
(5)400-(32×8+143)
=400-(256+143)
=400-399
=1;
(6)68×28+32×28
=(68+32)×28
=100×28
=2800.
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