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一.52+98×99+46= 二.48×1.08+1.2×56.8= 三.18×5/7-5×4/7= 2.5×2.85+

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/27 23:54:49
一.52+98×99+46= 二.48×1.08+1.2×56.8= 三.18×5/7-5×4/7= 2.5×2.85+0.25÷2/23
52+98×99+46
=98+98×99
=98×(1+99)
=98×100
=9800
48×1.08+1.2×56.8
=1.2×43.2+1.2×56.8
=1.2×(43.2+56.8)
=1.2×100
=120
18×5/7-5×4/7
=18×5/7-4×5/7
=5/7×(18-4)
=5/7×14
=10
2.5×2.85+0.25÷2/23
=2.5×2.85+0.25×11.5
=2.5×2.85+2.5×1.15
=2.5×(2.85+1.15)
=2.5×4
=10