Question

用简便方法计算

A、888*125÷（1000÷73）+888*73

B、67.3+32.7*69%-0.673*31

Answer 1

a. 原式=111*8*125÷1000*73+888*73 也可直接写为=111*（8*125÷1000）*73+888*73
=111*73+888*73 =（111+888）*73
=999*73 =（1000-1）*73
=73000-73
=72927

b. 原式=67.3+32.7×(1-0.31)-67.3×0.31
=67.3+32.7-32.7×0.31-67.3×0.31
=100-(32.7+67.3)*0.31
=100-31
=69

Answer 2

A、888×125÷（1000÷73）+888×73
=111×（8×125）÷（1000÷73）+888×73
=111×1000÷1000×73 + 888×73
=111×73 + 888×73
= 73×（111+888）
=73×（1000 -1）
=73000 - 73
=72927

B、67.3+32.7×69%-0.673×31
= 67.3 - 0.673×31 +32.7×69%
=67.3 - 67.3×0.31 + 32.7×0.69
=67.3×（1 - 0.31）+32.7×0.69
=67.3×0.69 +32.7×0.69
=0.69×（67.3 +32.7）
=0.69×100
=69

Answer 3

A
888*125÷（1000÷73）+888*73
8*125=1000
888*125÷（1000÷73）+888*73
=111*8*125*73/1000+888*73
=111*73+888*73
=999*73=(1000-1)*73=73*1000-73=72927
B
67.3+32.7*69%-0.673*31
=67.3+32.7*0.69-67.3*0.31+32.7*0.31-32.7*0.31
=67.3+(32.7*0.69+32.7*0.31)-(67.3*0.31+32.7*0.31)
=67.3+32.7-31
=100-31=69