脱式计算,能简算的要简算8.6×10.1; &n...
脱式计算,能简算的要简算8.6×10.1;9.07-22.78÷3.4;5.6×(12.5-8.5÷0.85);150÷2.5+150÷7.5;(8.1-5.6)×0.9...
脱式计算,能简算的要简算8.6×10.1; 9.07-22.78÷3.4;5.6×(12.5-8.5÷0.85);150÷2.5+150÷7.5;(8.1-5.6)×0.9-1]×0.4; 8.25×4.08+0.75×4.08+4.08.
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(1)8.6×10.1
=8.6×(10+0.1)
=8.6×10+8.6×0.1
=86+0.86
=86.86;
(2)9.07-22.78÷3.4
=9.07-6.7
=2.37;
(3)5.6×(12.5-8.5÷0.85)
=5.6×(12.5-10)
=5.6×2.5
=14;
(4)150÷2.5+150÷7.5
=60+20
=80;
(5)[(8.1-5.6)×0.9-1]×0.4
=[2.5×0.9-1]×0.4
=[2.25-1]×0.4
=1.25×0.4
=0.5;
(6)8.25×4.08+0.75×4.08+4.08
=(8.25+0.75+1)×4.08
=10×4.08
=40.8.
=8.6×(10+0.1)
=8.6×10+8.6×0.1
=86+0.86
=86.86;
(2)9.07-22.78÷3.4
=9.07-6.7
=2.37;
(3)5.6×(12.5-8.5÷0.85)
=5.6×(12.5-10)
=5.6×2.5
=14;
(4)150÷2.5+150÷7.5
=60+20
=80;
(5)[(8.1-5.6)×0.9-1]×0.4
=[2.5×0.9-1]×0.4
=[2.25-1]×0.4
=1.25×0.4
=0.5;
(6)8.25×4.08+0.75×4.08+4.08
=(8.25+0.75+1)×4.08
=10×4.08
=40.8.
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