Question

又两道数学题

1.5/(除以)[(50.4+15.6)*M-23]=0.15
M=?

9090*271.4+2714*9090=?
第2题我是说有没有什么简便运算?

Answer 1

1.
(50.4+15.6)*M-23=10
66M=33
M=1/2
2.
9090*271.4+2714*9090
=2467026+24670260
=27137286

简便运算
9090*271.4+2714*9090
=909*2714+2714*9090
=2714*9999
=2714*(10000-1)
=27140000-2714
=27137286

Answer 2

1.1.5/(66M-23)=0.15
66M-23=10
M=0.5

2.原式=909*2714+9090*2714
=9999*2714
=10000*2714-2714
=27140000-2714
=27137286

Answer 3

1.5/[(50.4+15.6)*M-23]=0.15
(50.4+15.6)*M-23=10
66M=33
M=1/2

...=27137286

Answer 4

M=0.5
9090*271.4+2714*9090=27137286

Answer 5

1. 0.5
2. 拿计算器按