5×0.04= 4.8+4.08= 3.6÷0.2= 0.21×0.3=
0.4²= 1.2÷4= 0.36÷12= 2b-0.5b=
10-0.72+9.28= 2.5×0.4÷2.5×0.4=
①89.5÷0.4÷2.5
②10.1×8.3
③39.52÷5.2+5.08
④32.8×0.4+17.2×0.4
⑤2.5×1.25×3.2
⑥4.5×99+4.5
①2x+1.5x=17.5
②2x+23×4=134
③ 9(x+3.4)=75.6
④0.72×3-7x=0.06
⑤(x-6)÷7=14
⑥x-0.3x=2.1