2、(72*2/3+6)/90%=60

3、2X+0.5=6/7。

X=5/28

2.5/6 *12 =10 (DM) 5/6 * 5/6 = 25/6 (square decimeter), 5/6 * 5/6 = 125/265438+.

Iii. 1. 1 m = 1 1 decimeter.

11* 6+1* 9 * 2+6 * 9 * 2 = 372 (square decimeter)

1 1*6*9=594 (cubic decimeter)

Four. 2 1/3=7 (topic) 27/4=6.75 (topic)

Xiaoming runs very fast.

Verb (abbreviation of verb) 4*( 1-4/5)=4/5 (meter) or 4-4*4/5=4/5 (meter).

Six or three centimeters =30 centimeters.

30*30* 1.5= 1350 cubic centimeter = 1.35 cubic decimeter