用简便方法计算下面各题.156+68+44 748+215-248 &...
用简便方法计算下面各题.156+68+44748+215-2480.8+4.7+4.2+5.325×78×43.6×5.2+6.4×5.214×10.1...
用简便方法计算下面各题.156+68+44 748+215-248 0.8+4.7+4.2+5.3 25×78×4 3.6×5.2+6.4×5.2 14×10.1
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①156+68+44
=156+44+68
=200+68
=268;
②748+215-248
=748-248+215
=500+215
=715;
③0.8+4.7+4.2+5.3
=(0.8+4.2)+(4.7+5.3)
=5+10
=15;
④25×78×4
=25×4×78
=100×78
=7800;
⑤3.6×5.2+6.4×5.2
=(3.6+6.4)×5.2
=10×5.2
=52;
⑥14×10.1
=14×(10+0.1)
=14×10+14×0.1
=140+1.4
=141.4.
=156+44+68
=200+68
=268;
②748+215-248
=748-248+215
=500+215
=715;
③0.8+4.7+4.2+5.3
=(0.8+4.2)+(4.7+5.3)
=5+10
=15;
④25×78×4
=25×4×78
=100×78
=7800;
⑤3.6×5.2+6.4×5.2
=(3.6+6.4)×5.2
=10×5.2
=52;
⑥14×10.1
=14×(10+0.1)
=14×10+14×0.1
=140+1.4
=141.4.
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