Question

简便算法：1/8x58+1/8x41+1/8 5/9-0.375+11/18-5/8

Answer 1

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简便算法

1/8x58+1/8x41+1/8

=1/8×(58+41+1)

=1/8×100

=12.5

5/9-0.375+11/18-5/8

=(5/9+11/18)-(0.375+5/8)

=7/6-1

=1/6

解方程

0.6*（3.5-x）=1.2

3.5-x=2

x=3.5-2

x=1.5

5x-3*7/10=7/5

5x-2.1=1.4

5x=3.5

x=0.7