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简便方法计算:9.08+5.45+11.92+4.551.25×30×1.2×0.8(1.25+12.5+0.25)×822.61+9×22.61.

题目详情
简便方法计算:
9.08+5.45+11.92+4.55         
1.25×30×1.2×0.8
(1.25+12.5+0.25)×8              
22.61+9×22.61.
▼优质解答
答案和解析
(1)9.08+5.45+11.92+4.55
=9.08+11.92+(4.55+5.45)
=20+10
=30;

(2)1.25×30×1.2×0.8
=1.25××0.8×30×1.2
=1×30×1.2
=36;

(3)(1.25+12.5+0.25)×8 
=1.25×8+12.5×8+0.25×8
=10+10+2
=22;

(4)22.61+9×22.61
=(1+9)×22.61
=10×22.61
=226.1.