简便① 3.6÷0.4-1.2X5 ②90÷（3.6-1.8）③（31.6-11.7）÷2.5÷0.4 ④3.4X7.8÷3.9 ⑤2.23X4+4.77÷0.25
来源：学生作业帮助网 编辑：六六作业网 时间：2024/12/04 01:13:12
简便① 3.6÷0.4-1.2X5 ②90÷（3.6-1.8）③（31.6-11.7）÷2.5÷0.4 ④3.4X7.8÷3.9 ⑤2.23X4+4.77÷0.25
简便① 3.6÷0.4-1.2X5 ②90÷（3.6-1.8）③（31.6-11.7）÷2.5÷0.4 ④3.4X7.8÷3.9 ⑤2.23X4+4.77÷0.25
简便① 3.6÷0.4-1.2X5 ②90÷（3.6-1.8）③（31.6-11.7）÷2.5÷0.4 ④3.4X7.8÷3.9 ⑤2.23X4+4.77÷0.25
① 3.6÷0.4-1.2X5
=1.2X（3÷0.4）-1.2X5
=1.2X（7.5-5 ）
=1.2X2.5
=0.3X（4X2.5）
=0.3X10
=3
②90÷（3.6-1.8）
=90÷1.8
=5X（18÷1.8）
=5X10
=50
③（31.6-11.7）÷2.5÷0.4
=（31.6-11.7）÷（2.5X0.4 ）
=19.9÷1
=19.9
④3.4X7.8÷3.9
=3.4X2X（3.9÷3.9 ）
=6.8X1
=6.8
⑤2.23X4+4.77÷0.25
=2.23X4+（4.77X4）÷（0.25X4）
=2.23X4+（4.77X4）÷1
=2.23X4+4.77X4
=（2.23+4.77）X4
=7X4
=28
① 3.6÷0.4-1.2X5
=9-6
=3
②90÷（3.6-1.8）
=90÷1.8
=90÷9÷0.2
=10×5
=50
③（31.6-11.7）÷2.5÷0.4
=（31.6-11.7）÷﹙2.5×0.4 ﹚
=19.9÷1
=19.9
④3.4X7.8÷3.9
=3.4×2
全部展开
① 3.6÷0.4-1.2X5
=9-6
=3
②90÷（3.6-1.8）
=90÷1.8
=90÷9÷0.2
=10×5
=50
③（31.6-11.7）÷2.5÷0.4
=（31.6-11.7）÷﹙2.5×0.4 ﹚
=19.9÷1
=19.9
④3.4X7.8÷3.9
=3.4×2
=6.8
⑤2.23X4+4.77÷0.25
=2.23X4+4.77×4
=﹙2.23+4.77﹚×4
=7×4
=28
收起