简便运算17.48+3.17-(2.48-6.83) 3.6*11.1+1.2*66.7 【*代表乘号】 12.8*34.5+12.8*12.3+46.8*87.27.2*14.5+17*2.8 【 8 4/3】-.35+(【1 4/1】-【6 20/13】) 注意;【8 4/3】等于8又4分之3.全部都是这样
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![简便运算17.48+3.17-(2.48-6.83) 3.6*11.1+1.2*66.7 【*代表乘号】 12.8*34.5+12.8*12.3+46.8*87.27.2*14.5+17*2.8 【 8 4/3】-.35+(【1 4/1】-【6 20/13】) 注意;【8 4/3】等于8又4分之3.全部都是这样](/uploads/image/z/67911-15-1.jpg?t=%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%9717.48%2B3.17-%282.48-6.83%29+3.6%2A11.1%2B1.2%2A66.7+%E3%80%90%2A%E4%BB%A3%E8%A1%A8%E4%B9%98%E5%8F%B7%E3%80%91+12.8%2A34.5%2B12.8%2A12.3%2B46.8%2A87.27.2%2A14.5%2B17%2A2.8+%E3%80%90+8+4%2F3%E3%80%91-.35%2B%28%E3%80%901+4%2F1%E3%80%91-%E3%80%906+20%2F13%E3%80%91%EF%BC%89+%E6%B3%A8%E6%84%8F%EF%BC%9B%E3%80%908+4%2F3%E3%80%91%E7%AD%89%E4%BA%8E8%E5%8F%884%E5%88%86%E4%B9%8B3.%E5%85%A8%E9%83%A8%E9%83%BD%E6%98%AF%E8%BF%99%E6%A0%B7)
简便运算17.48+3.17-(2.48-6.83) 3.6*11.1+1.2*66.7 【*代表乘号】 12.8*34.5+12.8*12.3+46.8*87.27.2*14.5+17*2.8 【 8 4/3】-.35+(【1 4/1】-【6 20/13】) 注意;【8 4/3】等于8又4分之3.全部都是这样
简便运算1
7.48+3.17-(2.48-6.83) 3.6*11.1+1.2*66.7 【*代表乘号】
12.8*34.5+12.8*12.3+46.8*87.2
7.2*14.5+17*2.8 【 8 4/3】-.35+(【1 4/1】-【6 20/13】) 注意;【8 4/3】等于8又4分之3.全部都是这样
简便运算17.48+3.17-(2.48-6.83) 3.6*11.1+1.2*66.7 【*代表乘号】 12.8*34.5+12.8*12.3+46.8*87.27.2*14.5+17*2.8 【 8 4/3】-.35+(【1 4/1】-【6 20/13】) 注意;【8 4/3】等于8又4分之3.全部都是这样
7.48+3.17-(2.48-6.83)
=7.48+3.17-2.48+6.83
=(7.48-2.48)+(3.17+6.83)
=5+10
=15
3.6*11.1+1.2*66.7
=1.2*3*11.1+1.2*66.7
=1.2*33.3+1.2*66.7
=1.2*(33.3+66.7)
=1.2*100
=120
12.8*34.5+12.8*12.3+46.8*87.2
=12.8*(34.5+12.3)+46.8*87.2
=12.8*46.8+46.8*87.2
=46.8*(12.8+87.2)
=46.8*100
=4680
问题补充:
7.2*14.5+17*2.8
=7.2*(17-2.5)+17*2.8
=7.8*17-72*0.25+17*2.8
=17*(7.8+2.8)-72÷4
=17*10-18
=170-18
=152
【 8 4/3】-.35+(【1 4/1】-【6 20/13】)
=8.75-.35+1.25-6.65
=(8.75+1.25)-(6.65+0.35)
=10-7
=3
1:
=7.48+3.17-2.48+6.83
=7.48-2.48+3.17+6.83
=5+10=15
2:
1.2*3*11.1+1.2*66.7
=1.2*33.3+1.2*66.7
=1.2*(33.3+66.7)
=1.2*100
=120
3:
=12.8*(34.5+12.3)+46.8*87.2
=12.8*46.8+46.8*87.2
=46.8*(12.8+87.2)
=46.8*100
=4680
A. 7.48+3.17-(2.48-6.83)
= 7.48+3.17-2.48+6.83=(7.48-2.48)+(3.17+6.83)=5+10=15 将可以合成整数的运算放到一起
B. 3.6*11.1+1.2*66.7
= (1.2*3)*11.1+1.2*66.7=1.2*(3*11.1)+1.2*66.7=1.2*33.3+1.2*66.7=...
全部展开
A. 7.48+3.17-(2.48-6.83)
= 7.48+3.17-2.48+6.83=(7.48-2.48)+(3.17+6.83)=5+10=15 将可以合成整数的运算放到一起
B. 3.6*11.1+1.2*66.7
= (1.2*3)*11.1+1.2*66.7=1.2*(3*11.1)+1.2*66.7=1.2*33.3+1.2*66.7=1.2*(33.3+66.7)=1.2*100=120 提取共有的因数
C. 12.8*34.5+12.8*12.3+46.8*87.2
=12.8*(34.5+12.3)+46.8*87.2=12.8*46.8+46.8*87.2=46.8*(12.8+87.2)=46.8*100=46800 分步提取
收起
(7.48-2.48)+(3.17+6.83)=15 3*1.2*11.1+1.2*66.7=1.2*(3*11.1+66.7)=120
7.48+3.17-(2.48-6.83)=7。48+3.17-2.48+6.83=(7.48-2.48)+(3.17+6.83)=5+10=15