题目内容

口算.
800-250= 30×40= 8100÷900= 10-0.98= 105÷7= 560+770=
0.25×0.4= 6.3÷0.07= 0.64÷8= 8.85×10= 4.73+0.7=
3
9
+
7
9
=
5
8
×
4
10
=
5
6
÷3
=
5
8
-
1
2
=
3.6×
1
4
=
8×1.36×1.25= 7.2×2.8+2.8×0.8=
800-250=550, 30×40=1200, 8100÷900=9, 10-0.98=9.02, 105÷7=15, 560+770=1330,
0.25×0.4=0.1, 6.3÷0.07=90, 0.64÷8=0.08, 8.85×10=88.5, 4.73+0.7=5.43,
3
9
+
7
9
=
10
9
5
8
×
4
10
=
1
4
5
6
÷3
=
5
18
5
8
-
1
2
=
1
8
3.6×
1
4
=0.9,
8×1.36×1.25=13.6, 7.2×2.8+2.8×0.8=22.4.
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