解方程和简算(能简算要简算)x:25=200分之一(解方程) 简算:八分之三+八分之五×十分之三 12÷(三分之一+ 四
2个回答

X:25=1/200

X=1/200×25

X=1/8

3/8+5/8×3/10

=3/8+3/8×5/10

=3/8×(1+5/10)

=3/8×3/2

=9/16

12÷(1/3+1/4)

=12÷7/12

=144/7

=20又4/7

45÷1.8+1.3×0.6

=25+0.78

=25.78

2/9×0.375÷6/7

=2/9×3/8×7/6

=7/72