问题
解答题
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答案
①3.5X+1.8=12.3 3.5X+1.8-1.8=12.3-1.8 3.5X=10.5 3.5X÷3.5=10.5÷3.5 X=3; ②0.8X-4=1.6 0.8X-4+4=1.6+4 0.8X=5.6 0.8X÷0.8=5.6÷0.8 X=7; | |||||||||
③5X÷2=10 X=4 ④X-0.25X=3 0.75X=8 0.75X÷0.75=8÷0.75 X=10 | |||||||||
⑤X+
1.4X=21 1.4X÷1.4=21÷1.4 X=15 ⑥ |
6 |
5 |
1 |
2 |
X×6 5
=5 6
×1 2 5 6
X=
;5 12