50%x﹣0.2x=15; =12; 6:30=x:0.5.
①36:x=48:4
② :x= :
③5x÷0.5=42.
计算:
原式= .
+27= 4- = 2.5×0.4= 1-0.05=
÷ = 5.8÷0.1= ×2.4= 3× ÷ ×3=
①( + )×56
② ×26+7÷ - ×6
③ × ÷
④72÷( ÷ )
⑤ ×[( + )÷ ]
⑥ ÷( - )×
①
②
③
④
⑤
⑥