數學題,幫下手!

1)200X22.5%X12
=200×22.5/100×12
=45×12
=540

2)200X(100-40-22.5)X6
=200×37.5×6
=45000

3)900X(1+16﹪)
=900×116%
=1044

4)27-25/27(ニ十七分之二十七減二十五)X100﹪
=2/27×100%
=200/27%

5)1500X6﹪X2
=1500×6/100×2
=90×2
=180

6) 1500X y X6﹪=450
1500 × 6/100 × y=450
(15×6)y =450
90y =450
y =5

7)y X3X6﹪=360
y ×3×6/100=360
9/50y=360
y=360×50/9
y=40×50
y=2000

1./ 200*22.5%*12
=45*12
=540

2./ 200*(100-40-22.5)*6
=200*(60-22.5)*6
=200*37.5*6
=45000

3./ 900*(1+16%)
=900*116%
=1044

4./ (27-25)/27*100%
=2/27*100%
=7.4074%

5./ 1500*6%*2
=90*2
=180

6./ 1500*y*6%=450
90y=450
y=5

7./ y*3*6%=360
y*9/50=360
y=2000