如题所述
一个句号算一层括号吗?
3.5乘以1又1/4加1.25加1.25乘以二又7/10。加3.8。除以4/5
={[3.5x(1+1/4)+1.25+1.25x(2+7/10)]+3.8}÷(4/5)
={[(7/2)x(5/4)+(5/4)+(5/4)x(27/10)]+3.8}÷(4/5)
={[(5/4)(7/2+1+27/10)]+3.8}÷(4/5)
={[(5/4)(35/10+10/10+27/10)]+3.8}÷(4/5)
={[(5/4)(72/10)]+3.8}÷(4/5)
={[(5/4)(36/5)]+3.8}÷(4/5)
={9+3.8}÷(4/5)
=12.8÷(4/5)
=12.8x5/4
=3.2x5
=16
3.5乘以1又1/4加1.25加1.25乘以二又7/10。加3.8。除以4/5
={[3.5x(1+1/4)+1.25+1.25x(2+7/10)]+3.8}÷(4/5)
={[(7/2)x(5/4)+(5/4)+(5/4)x(27/10)]+3.8}÷(4/5)
={[(5/4)(7/2+1+27/10)]+3.8}÷(4/5)
={[(5/4)(35/10+10/10+27/10)]+3.8}÷(4/5)
={[(5/4)(72/10)]+3.8}÷(4/5)
={[(5/4)(36/5)]+3.8}÷(4/5)
={9+3.8}÷(4/5)
=12.8÷(4/5)
=12.8x5/4
=3.2x5
=16
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