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《五年级口算速算天天练》参考答案34-50
练28 三、观察物体
720+180 = 900 0.36÷4 = 0.09 7.8×5×2 = 78
298×2 = 596 4.2-0.8 = 3.4 320×50÷25 = 640
0.8×3 = 2.4 4.6÷2 = 2.3 0.125×5.9×8 = 5.9
0.4×300 = 120 0.46÷2 = 0.23 21×45÷7 = 135
0.6×0.6 = 0.36 8.8÷4 = 2.2 2.8+1.6+0.4 = 4.8
0.5×101 = 50.5 72×125 = 9000 5×7+39 = 74
0.84÷6 = 0.14 3.81×2 = 7.62 0.125×15×8 = 15
123×5 = 615 0.4×200 = 80 2.5×44 = 110
5.4÷0.9 = 6 9.6×0.5 = 4.8 0.6×0.5×30 = 9
0.8÷0.2 = 4 2.45÷0.01 = 245 17×28+28×83 = 2800
0×4.25 = 0 50×3.2 = 160 54-32.4-16.6 = 5
695-474 = 221 52×99 = 5148 15×4×0.7 = 42
0.32÷0.32 = 1 4.8×3 = 14.4 99×0.61+0.61 = 61
0.25×2 = 0.5 7.2×5 = 36 1.2÷0.2×50 = 300
3.25×4 = 13 0.35×100 = 35 1.25×32×25 = 1000
0÷6.48 = 0 0.63÷30 = 0.021 2.4×(5+5) = 24
63×90 = 5670 4.5×0.1 = 0.45 13×25×4 = 1300
3.2÷4 = 0.8 324÷100 = 3.24 1300-700+500 = 1100
308-48 = 260 7×0.6 = 4.2 420÷6÷7 = 10
24×25 = 600 1.24×4 = 4.96 43×4×5 = 860
数奥同步学答案
右图(略)中有 60 个长方形(应为“矩形”,否则总数中应减去正方形个数)。
(4+3+2+1) × (3+2+1) = 60 (个)
练29 三、观察物体
0.42÷0.07 = 6 0.5×101 = 50.5 0.48+3.52-3 = 1
52×99 = 5148 9.6×0.5 = 4.8 9×0.4÷6 = 0.6
0.63÷30 = 0.021 7.3÷7.3 = 1 63×30÷30 = 63
30×3.5 = 105 324÷100 = 3.24 30÷0.1÷60 = 5
5.4÷0.9 = 6 7×0.6 = 4.2 4.2-3.6+0.4 = 1
0.35×100 = 35 69.1-47.4 = 21.7 120×25÷5 = 600
7.8×6 = 46.8 4.8×3 = 14.4 6.5÷5×4 = 5.2
1.5×9.9 = 14.85 0.36÷4 = 0.09 1.8×15÷3 = 9
4.5×0.1 = 0.45 123×5 = 615 (0.17-0.09)÷0.2 = 0.4
3.8×9.9 = 37.62 24×25 = 600 6.28+3.72+10 = 20
0.84÷6 = 0.14 72×125 = 9000 2.5×32×1.25 = 100
0.35×100 = 35 0.6×0.6 = 0.36 6×0.14÷3 = 0.28
4.2-0.8 = 3.4 1.24×4 = 4.96 6×3.1÷20 = 0.93
7×0.6 = 4.2 3.25×4 = 13 45×30÷5 = 270
0.8×3 = 2.4 8.8÷4 = 2.2 4.2×20÷6 = 14
4.6÷2 = 2.3 0.25×2 = 0.5 50×0.04×0.1 = 0.2
4.5×0.1 = 0.45 50×3.2 = 160 3.6+6.4+7 = 17
0×4.25 = 0 3.81×2 = 7.62 12.5×0.8×10 = 100
0.46÷2 = 0.23 0.4×200 = 80 0.42×200÷4 = 21
3.2×4 = 12.8 63×90 = 5670 10+7.84+19 = 36.84
数奥同步学答案
图(略),正方体的六个面上A、B、C、D、E
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