1 直接写出得数。(每题1分,共20分)
$9.35 + 1.59 = $ $1.12×0.3 = $ $899 - 672 = $ $31.8 - 9.9 = $
$18.7 - 4.6 = $ $0.6×0.75 = $ $68.4 - 27.6 = $ $3.68 + 1.96 = $
$6×0.8 = $ $0.5 + 1÷1 = $ $17 + 6.9 = $ $2.5×4 = $
$16 - 9.9 = $ $1.6×7 = $ $0.25×4 = $ $92.5 + 48.1 = $
$66.5 + 38.2 = $ $29.1 - 15 = $ $4.2 - 1.6 = $ $6.2 - 5.1 = $
$9.35 + 1.59 = $ $1.12×0.3 = $ $899 - 672 = $ $31.8 - 9.9 = $
$18.7 - 4.6 = $ $0.6×0.75 = $ $68.4 - 27.6 = $ $3.68 + 1.96 = $
$6×0.8 = $ $0.5 + 1÷1 = $ $17 + 6.9 = $ $2.5×4 = $
$16 - 9.9 = $ $1.6×7 = $ $0.25×4 = $ $92.5 + 48.1 = $
$66.5 + 38.2 = $ $29.1 - 15 = $ $4.2 - 1.6 = $ $6.2 - 5.1 = $
答案
10.94 0.336 227 21.9
14.1 0.45 40.8 5.64
4.8 1.5 23.9 10
6.1 11.2 1 140.6
104.7 14.1 2.6 1.1
14.1 0.45 40.8 5.64
4.8 1.5 23.9 10
6.1 11.2 1 140.6
104.7 14.1 2.6 1.1
2 计算下列各题,能简算的要简算。(每题3分,共18分)
$3.64÷(1.9 - 0.5)$ $63.4÷2.5÷0.4$ $11.5×3.7 - 2.5×3.7 + 3.7$
$1.75÷0.25×6$ $0.92×1.01$ $327×2.8 + 17.3×28$
$3.64÷(1.9 - 0.5)$ $63.4÷2.5÷0.4$ $11.5×3.7 - 2.5×3.7 + 3.7$
$1.75÷0.25×6$ $0.92×1.01$ $327×2.8 + 17.3×28$
答案
2.6 63.4 37
42 0.9292 1400
42 0.9292 1400
3 解方程。(每题4分,共12分)
$3x + 2 = 8.6$ $4.2x + 3×1.3 = 16.5$ $4x + 1.6x = 18.48$
$3x + 2 = 8.6$ $4.2x + 3×1.3 = 16.5$ $4x + 1.6x = 18.48$
答案
解:x = 2.2 解:x = 3 解:x = 3.3
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