÷7=
×9×=
×=
×(18+)=
+×12=
÷60%=
(3+)×0=
50%+=
×÷×=
17.15-(3.5-2.85)=
12÷0.9≈
12÷0.03=
25×40%=
2.4-2.4×0.5=
8×5÷8×5=
50%×2.5××64 32 × (+)
(1-75%)÷(1+) ÷[( -0.75)×60%]
2017× 3.8×25%+6.2×0.25
-+1- (-+)×48
0.25×1.25÷ 8.5×80%+1.5÷
( + )×17×21 2022 ×