题目内容

【题目】脱式计算。(能简便的要简便)(18分)

2.5×7.1×4 64-2.64×0.5 5.2×0.9+0.9×4.8

3.28×4.9+6.72×4.9 0.25×1.25×0.4

9.73×4.8-4.73×4.8 12.5×4+3.12÷1.2

25.2-(7.8-2.6)×1.3 14.08÷[0.8×(7.93-2.43)]

【答案】5×7.1×4 64-2.64×0.5 5.2×0.9+0.9×4.8

=2.5×4×7.1 =64-1.32 =(5.2+4.8)×0.9

=10×7.1 =62.68 =10×0.9

=71 =9

3.28×4.9+6.72×4.9 0.25×1.25×0.4

=(3.28+6.72)×4.9 =0.25×0.4×1.25

=10×4.9 =0.1×1.25

=49 =0.125

9.73×4.8-4.73×4.8 12.5×4+3.12÷1.2

=(9.73-4.73)×4.8 =50+2.6

=5×4.8 52.6

=24

25.2-(7.8-2.6)×1.3 14.08÷[0.8×(7.93-2.43)]

=25.2-5.2×1.3 = 14.08÷[0.8×5.5]

=25.2-6.76 = 14.08÷4.4

=18.44 =3.2

【解析】略

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