计算下列各题(能用简便方法的用简便方法计算)0.125×8.75×81.8÷0.5÷0.612.75÷[14.6-(1.3+8.2)
计算下列各题(能用简便方法的用简便方法计算)0.125×8.75×81.8÷0.5÷0.612.75÷[14.6-(1.3+8.2)]0.7×10.10.5x-7=282...
计算下列各题(能用简便方法的用简便方法计算)0.125×8.75×81.8÷0.5÷0.612.75÷[14.6-(1.3+8.2)]0.7×10.10.5x-7=282.1x-x=1.21.
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(1)0.125×8.75×8
=0.125×8×8.75
=1×8.75
=8.75;
(2)1.8÷0.5÷0.6
=1.8÷(0.5×0.6)
=1.8÷0.3
=6;
(3)12.75÷[14.6-(1.3+8.2)]
=12.75÷[14.6-9.5]
=12.75÷5.1
=2.5;
(4)0.7×10.1
=0.7×(10+0.1)
=0.7×10+0.7×0.1
=7+0.07
=7.07;
(5)0.5x-7=28
0.5x-7+7=28+7
0.5x=35
0.5x÷0.5=35÷0.5
x=70;
(6)2.1x-x=1.21
1.1x=1.21
1.1x÷1.1=1.21÷1.1
x=1.1.
=0.125×8×8.75
=1×8.75
=8.75;
(2)1.8÷0.5÷0.6
=1.8÷(0.5×0.6)
=1.8÷0.3
=6;
(3)12.75÷[14.6-(1.3+8.2)]
=12.75÷[14.6-9.5]
=12.75÷5.1
=2.5;
(4)0.7×10.1
=0.7×(10+0.1)
=0.7×10+0.7×0.1
=7+0.07
=7.07;
(5)0.5x-7=28
0.5x-7+7=28+7
0.5x=35
0.5x÷0.5=35÷0.5
x=70;
(6)2.1x-x=1.21
1.1x=1.21
1.1x÷1.1=1.21÷1.1
x=1.1.
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