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4. 算一算。
$8.3 - 3.2 = $ $9.7 + 4.05 = $ $15.4 - 2.1 = $
$11.5 + 0.13 = $ $1 - 0.03 = $ $8.2 + 1.8 = $
$6.33 ÷ 10 = $ $4.18 × 10 = $ $0.7 × 0.08 = $
$7.9 × 100 = $ $3.6 × 0.3 = $ $0.04 × 0.02 = $
$8.3 - 3.2 = $ $9.7 + 4.05 = $ $15.4 - 2.1 = $
$11.5 + 0.13 = $ $1 - 0.03 = $ $8.2 + 1.8 = $
$6.33 ÷ 10 = $ $4.18 × 10 = $ $0.7 × 0.08 = $
$7.9 × 100 = $ $3.6 × 0.3 = $ $0.04 × 0.02 = $
答案
5.1 13.75 13.3 11.63 0.97 10 0.633 41.8 0.056 790 1.08 0.0008
5. 用竖式计算。
$17.52 + 5.09 = $ $30 - 3.61 = $
$3.05 × 0.84 = $ $870 × 0.92 = $
$17.52 + 5.09 = $ $30 - 3.61 = $
$3.05 × 0.84 = $ $870 × 0.92 = $
答案
(竖式略)22.61 26.39 2.562 800.4
6. 解方程。
$3x + 5.4 = 15.6$ $6x - 26 = 34$ $9x - 4x = 105$
$3x + 5.4 = 15.6$ $6x - 26 = 34$ $9x - 4x = 105$
答案
$x=3.4$ $x=10$ $x=21$
7. 用简便算法计算。
$5.2 - 0.26 - 0.74$ $7.3 × 3.8 + 7.3 × 6.2$
$15.39 + 22.67 + 4.61 + 7.33$ $1.27 × 0.59 - 0.27 × 0.59$
$5.2 - 0.26 - 0.74$ $7.3 × 3.8 + 7.3 × 6.2$
$15.39 + 22.67 + 4.61 + 7.33$ $1.27 × 0.59 - 0.27 × 0.59$
答案
4.2 73 50 0.59
