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| 1﹣0.01= | 7÷1.4= |
| 720﹣80= | 90÷70= |
2.25+  = | 16×50%= |
 ×3.6= | 25.5÷0.1= |
 +  = |  ﹣ = |
2﹣  ﹣  = | 1.25×8= |
（ ）：  = | 4×（0.6+1.9）= |
（0.18+  ）÷9= |  ×  ×  = |
同类型试题
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
