简便计算:1)7.8×3.4÷3.9 2)5.5×8+4.5÷0.125(1) 7.8×3.4÷3.9 (2) 5.5×8+4.5÷0.125

来源:学生作业帮助网 编辑:作业帮 时间:2024/04/29 05:32:54
简便计算:1)7.8×3.4÷3.9 2)5.5×8+4.5÷0.125(1) 7.8×3.4÷3.9 (2) 5.5×8+4.5÷0.125

简便计算:1)7.8×3.4÷3.9 2)5.5×8+4.5÷0.125(1) 7.8×3.4÷3.9 (2) 5.5×8+4.5÷0.125
简便计算:1)7.8×3.4÷3.9 2)5.5×8+4.5÷0.125
(1) 7.8×3.4÷3.9
(2) 5.5×8+4.5÷0.125

简便计算:1)7.8×3.4÷3.9 2)5.5×8+4.5÷0.125(1) 7.8×3.4÷3.9 (2) 5.5×8+4.5÷0.125
变式法
1)7.8X3.4÷3.9
=7.8÷3.9*3.4
=2X3.4
=6.8
2) 5.5 x 8+ 4.5÷0.125
=(1+4.5)x 8+ 4.5÷0.125
=1 x 8 +4.5x8 +4.5÷0.125
=1 x 8 +4.5x8 +4.5 x 1/8
=1 x8 +4.5 (8 x 1/8)
=12.5