估算或直接写得数32×98≈ 9800÷15≈ 598+204≈ 307+448≈ ( 1 8 + 1 4

2024-12-28 00:00:08
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回答1:

32×98≈3000; 9800÷15≈660; 598+204≈800; 307+448≈750;
1
8
+
1
4
)×4=1
1
2
3
4
÷
1
4
=3;
7.2÷0.4=18;
1
9
-
1
9
×
1
9
=
8
81
1
6
÷6×
1
6
=
1
36
3.9×3=11.7; 1-0.92=0.08; 2+2%=2.02.