计算下面各题,能简便计算的就简算:0.398+0.36+3.64;15.75+3.59-0.59+14.25;47.8-7.45+8.8;66.86-8.6
计算下面各题,能简便计算的就简算:0.398+0.36+3.64;15.75+3.59-0.59+14.25;47.8-7.45+8.8;66.86-8.66-1.34;...
计算下面各题,能简便计算的就简算:0.398+0.36+3.64;15.75+3.59-0.59+14.25;47.8-7.45+8.8;66.86-8.66-1.34;42.5-(6.07+1.13)
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(1)0.398+0.36+3.64
=0.398+(0.36+3.64)
=0.398+4
=4.398
(2)15.75+3.59-0.59+14.25
=(15.75+14.25)+(3.59-0.59)
=30+3
=33
(3)47.8-7.45+8.8
=40.35+8.8
=49.15
(4)66.86-8.66-1.34
=58.2-1.34
=56.86
(5)42.5-(6.07+1.13)
=42.5-7.2
=35.3
=0.398+(0.36+3.64)
=0.398+4
=4.398
(2)15.75+3.59-0.59+14.25
=(15.75+14.25)+(3.59-0.59)
=30+3
=33
(3)47.8-7.45+8.8
=40.35+8.8
=49.15
(4)66.86-8.66-1.34
=58.2-1.34
=56.86
(5)42.5-(6.07+1.13)
=42.5-7.2
=35.3
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