能简便计算就简便计算。 2.5×38×4 6.8×72.8+6.8×21.8 97.8-2.6×4
能简便计算就简便计算。2.5×38×46.8×72.8+6.8×21.897.8-2.6×4.525-12.35-7.6515.6+2.5×2.4(43.8-27.65)...
能简便计算就简便计算。
2.5×38×4
6.8×72.8+6.8×21.8
97.8-2.6×4.5
25-12.35-7.65
15.6+2.5×2.4
(43.8-27.65)×1.2 展开
2.5×38×4
6.8×72.8+6.8×21.8
97.8-2.6×4.5
25-12.35-7.65
15.6+2.5×2.4
(43.8-27.65)×1.2 展开
1个回答
2016-04-25 · 知道合伙人教育行家
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2.5×38×4
=2.5×4×38
=10×38
=380
6.8×78.2+6.8×21.8
=6.8×(78.2+21.8)
=6.8×100
=680
97.8-2.6×4.5
=97.8-11.7
=86.1
25-12.35-7.65
=25-(12.35+7.65)
=25-20
=5
15.6+2.5×2.4
=15.6+2.5×4×0.6
=15.6+6
=21.6
(43.8-27.65)×1.2
=16.15×1.2
=19.38
=2.5×4×38
=10×38
=380
6.8×78.2+6.8×21.8
=6.8×(78.2+21.8)
=6.8×100
=680
97.8-2.6×4.5
=97.8-11.7
=86.1
25-12.35-7.65
=25-(12.35+7.65)
=25-20
=5
15.6+2.5×2.4
=15.6+2.5×4×0.6
=15.6+6
=21.6
(43.8-27.65)×1.2
=16.15×1.2
=19.38
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