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хорошист7681
@хорошист7681
July 2022
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Упростите выражение и найдите его значение: 1) 3(5-2x)+10x при х=0.2
2) 4(0.7х+3)-5х при х=1.5
3) 9(0.8-х)+2.8-3х при х=1.8
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Answers & Comments
Sasha28042003
1) 15-6х+10х=15+4х=15+4*0.2=15+0.8=15.8
2) 2.8х+12-5х=12-2.2х=12-2.2*1.5=8.7
3) 7.2-9х+2.8-3х=10-12х=10-12х=10-12*1.8=-11.6
0 votes
Thanks 0
19102016
3(5-2х)+10х= 15-6х+10х=15+4х=15+4×0.2= 15+0.8=15.8
4(0.7х+3)-5х= 2.1х+12-5х=-2.9х+12= - 2.9×1.5+12=-4.35+12=7.65
9(0.8-х)+2.8-3х= 7.2- 9х+2.8-3х=10-12х= 10-21.6= -11.6
2 votes
Thanks 1
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Answers & Comments
2) 2.8х+12-5х=12-2.2х=12-2.2*1.5=8.7
3) 7.2-9х+2.8-3х=10-12х=10-12х=10-12*1.8=-11.6
4(0.7х+3)-5х= 2.1х+12-5х=-2.9х+12= - 2.9×1.5+12=-4.35+12=7.65
9(0.8-х)+2.8-3х= 7.2- 9х+2.8-3х=10-12х= 10-21.6= -11.6