问题
解答题
34.67-28.7(验算)
32.2÷4.2(保留一位小数)
32.8×(1.88÷4.7)
(21.88+29.8)÷7.6
5.2×(4.6÷0.92×0.04)
答案
①34.67-28.7=5.97,
验算:5.97+28.7=34.67;
②32.2÷4.2≈7.7;
③32.8×(1.88÷4.7),
=32.8×0.4,
=13.12;
④(21.88+29.8)÷7.6,
=51.68÷7.6,
=6.8;
⑤5.2×(4.6÷0.92×0.04),
=5.2×(5×0.04),
=5.2×0.2,
=1.04.