1、求:123+234+345+456+567+678+789—————————————————— 12.3+23.4+34.5+45.6+56.7+67.8+78.9横线是分数线,分子是123,234这样的数,分母是12.3,23.4这样的数.2、求:39×148\149 +148×86\149 +48×74\149
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![1、求:123+234+345+456+567+678+789—————————————————— 12.3+23.4+34.5+45.6+56.7+67.8+78.9横线是分数线,分子是123,234这样的数,分母是12.3,23.4这样的数.2、求:39×148\149 +148×86\149 +48×74\149](/uploads/image/z/3747729-57-9.jpg?t=1%E3%80%81%E6%B1%82%3A123%2B234%2B345%2B456%2B567%2B678%2B789%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E2%80%94%E2%80%94+12.3%2B23.4%2B34.5%2B45.6%2B56.7%2B67.8%2B78.9%E6%A8%AA%E7%BA%BF%E6%98%AF%E5%88%86%E6%95%B0%E7%BA%BF%2C%E5%88%86%E5%AD%90%E6%98%AF123%2C234%E8%BF%99%E6%A0%B7%E7%9A%84%E6%95%B0%2C%E5%88%86%E6%AF%8D%E6%98%AF12.3%2C23.4%E8%BF%99%E6%A0%B7%E7%9A%84%E6%95%B0.2%E3%80%81%E6%B1%82%EF%BC%9A39%C3%97148%5C149+%2B148%C3%9786%5C149+%2B48%C3%9774%5C149)
1、求:123+234+345+456+567+678+789—————————————————— 12.3+23.4+34.5+45.6+56.7+67.8+78.9横线是分数线,分子是123,234这样的数,分母是12.3,23.4这样的数.2、求:39×148\149 +148×86\149 +48×74\149
1、求:
123+234+345+456+567+678+789
—————————————————— 12.3+23.4+34.5+45.6+56.7+67.8+78.9
横线是分数线,分子是123,234这样的数,分母是12.3,23.4这样的数.
2、求:39×148\149 +148×86\149 +48×74\149(斜线不是除号,是分数线,比如:148\149读作:一百四十九分之一百四十八,用空格分开,好让大家辨认)
3、计算:
1+2+3+4+5+6+7+8+7+6+5+4+3+2+1
———————————————
888888×888888
1、求:123+234+345+456+567+678+789—————————————————— 12.3+23.4+34.5+45.6+56.7+67.8+78.9横线是分数线,分子是123,234这样的数,分母是12.3,23.4这样的数.2、求:39×148\149 +148×86\149 +48×74\149
123+234+345+456+567+678+789
—————————————————— 12.3+23.4+34.5+45.6+56.7+67.8+78.9
=7乘10除以7
=10
39×148\149 +148×86\149 +48×74\149=
互相抵消,的148
1+2+3+4+5+6+7+8+7+6+5+4+3+2+1=
(1+8)乘8除2=36 (7+1)乘7除以2=28
28+36=64
64和888888化简再乘888888