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脱式计算,能简算的要简算.27.9-13.06+2.14.7×11-4.728.8×6.3-6.3×18.84.8+2.4×985.37-(2.37-1.8)20.01-13.78+6.78.

题目详情
脱式计算,能简算的要简算.
27.9-13.06+2.1          
4.7×11-4.7           28.8×6.3-6.3×18.8    
4.8+2.4×98          5.37-(2.37-1.8) 20.01-13.78+6.78.
▼优质解答
答案和解析
(1)27.9-13.06+2.1
=(27.9+2.1)-13.06
=30-13.06
=16.94

(2)4.7×11-4.7
=4.7×(11-1)
=4.7×10
=47

(3)28.8×6.3-6.3×18.8
=(28.8-18.8)×6.3
=10×6.3
=63

(4)4.8+2.4×98
=4.8+2.4×2×49
=4.8+4.8×49
=4.8×(1+49)
=4.8×50
=240

(5)5.37-(2.37-1.8)
=5.37-2.37+1.8
=3+1.8
=4.8

(6)20.01-13.78+6.78
=20.01-(13.78-6.78)
=20.01-7
=13.01