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0.04 990 0.4的简便运算

(0.4-0.04)*25=0.4*25-0.04*25=10-1=9 乘法分配律

99/0.25/0.4=99/(0.25x0.4)=99/0.1=990如有帮助请采纳,如对本题有疑问可追问,Good luck!

0.2*0.4÷0.04=0.2*(0.4÷0.04)=0.2*10=2

(0.4+0.04)x25=0.4x25+0.04x25=10+1=11

0.04+99*0.04=0.04*(99+1)=0.04*100=4

(0.04+0.4+4)*0.25=0.04*0.25+0.4*0.25+4*0.25=0.01+0.1+1=1.11

0.4X25+0.04X25=10+1=11 请点击洗衣机的采纳谢谢~!

原式等于4*25+0.4*25+0.04*25=100+10+1=111 所以原式的计算结果为111.

=0.4*9.9+0.4*0.1=0.4*(9.9+0.1)0.4*10=4

2.9x0.4÷2.9x0.4=(2.9÷2.9)*(0.4*0.4)=1*0.16=0.16请点采纳谢谢

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