Question

求0.9乘8.4加1乘0.84 72乘1.25 0.36乘2.4加76乘0.036 125.125乘8加24.75乘4 7.68减3.56加2.32减5.44

78.4减31.94减18.06 2.61 乘39.5加0.318乘261加2.87乘26.1的简便运算

Answer 1

0.9乘8.4加1乘0.84
=9×0.84+0.84
=（9+1）租帆兆×0.84
=10×0.84
=8.4
72乘1.25
=9*（8*1.25）
=9*10
=90
0.36乘2.4加76乘0.036
=0.36×2.4+7.6×0.36
=0.36×（2.4+7.6）
=0.36×10
=3.6
125.125乘8加24.75乘4
=250.25×4+24.75×4
=（250.25+24.75）×4
=300×4
=1200
7.68减3.56加2.32减5.44
=（7.68+2.32）-（3.56+5.44）轿晌
=10-9
=1
=
78.4减31.94减弊租18.06
=78.4-（31.94+18.06）
=78.4-50
=28.4
2.61 乘39.5加0.318乘261加2.87乘26.1
=2.61×39.5+31.8×2.61+28.7×2.61
=2.61×（39.5+31.8+28.7）
=2.61×100
=261

Answer 2

78.4-(31.4+18.6)
=78.4-50
=28.6
2.61*39.5+0.318*261+2.87*26.1
=2.61*39.5+31.8*2.61+28.7*2.61
=2.61*(39.5+31.8+28.7)
=2.61*100
=261

Answer 3

..............不会

追问

cgnj

追答

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Answer 4

。。。。。。。