⑵ 负四分之三写作。
3.14×103=
8-4.6=
×16=
25÷0.25=
2+=
6.3÷9=
+=
10000÷99≈
⑴ 1.8÷1.5-0.5 × 0.3 ⑵ 1 ÷2.5 ÷4
⑶ 16 × 102 ⑷ × + ÷
⑸5 ×( × )× 7 ⑹ [ -( -60%)]÷
⑴4.5x + x= 11 ⑵ = ⑶ :8 = x :