3\4×2.83+1.17×3\4+0.75简便计算第一题:3\4×2.83+1.17×3\4+0.75第二题:2\5×18+4×320第三题:5-5×2\5+3\5第四题:3\4+11\15+1\4-1\15
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![3\4×2.83+1.17×3\4+0.75简便计算第一题:3\4×2.83+1.17×3\4+0.75第二题:2\5×18+4×320第三题:5-5×2\5+3\5第四题:3\4+11\15+1\4-1\15](/uploads/image/z/757673-17-3.jpg?t=3%5C4%C3%972.83%2B1.17%C3%973%5C4%2B0.75%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97%E7%AC%AC%E4%B8%80%E9%A2%98%EF%BC%9A3%5C4%C3%972.83%2B1.17%C3%973%5C4%2B0.75%E7%AC%AC%E4%BA%8C%E9%A2%98%EF%BC%9A2%5C5%C3%9718%2B4%C3%97320%E7%AC%AC%E4%B8%89%E9%A2%98%EF%BC%9A5-5%C3%972%5C5%2B3%5C5%E7%AC%AC%E5%9B%9B%E9%A2%98%EF%BC%9A3%5C4%2B11%5C15%2B1%5C4-1%5C15)
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3\4×2.83+1.17×3\4+0.75简便计算第一题:3\4×2.83+1.17×3\4+0.75第二题:2\5×18+4×320第三题:5-5×2\5+3\5第四题:3\4+11\15+1\4-1\15
3\4×2.83+1.17×3\4+0.75简便计算
第一题:
3\4×2.83+1.17×3\4+0.75
第二题:2\5×18+4×320
第三题:5-5×2\5+3\5
第四题:3\4+11\15+1\4-1\15
3\4×2.83+1.17×3\4+0.75简便计算第一题:3\4×2.83+1.17×3\4+0.75第二题:2\5×18+4×320第三题:5-5×2\5+3\5第四题:3\4+11\15+1\4-1\15
(1)
3\4×2.83+1.17×3\4+0.75
=3\4×2.83+3\4×1.17+3\4×1
=3\4×(2.83+1.17+1)
=3\4×4
=3
(2)
2\5×18+4×320
=0.4×18+4×320
=7.2+1280
=1287.2
(3)
5-5×2\5+3\5
=5-2+3\5
=3+3\5
=3又3\5
(4)
3\4+11\15+1\4-1\15
=(3\4+1\4)+(11\15-1\15)
=1+10/15
=1又2/3