①987+104×65﹣1747;
②86.4÷3.2﹣6.4×3.2;
③÷7+×;
④17﹣16.8÷(1.8+7.2×);
⑤( +﹣)×6.3;
⑥15÷〔( ﹣)÷〕﹣0.5;
⑦6÷+5×2.7﹣1×2;
⑧〔14.8﹣3÷(7﹣5.75)〕×0.4.
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