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
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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
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
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
=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
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
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