解方程5x-2+1.8=3.
解方程5x-2+1.8=3.67(x-1.2)=2.19.4x-0.4x=16.20.2x-0.4+0.5=3.7....
解方程5x-2+1.8=3.6 7(x-1.2)=2.1 9.4x-0.4x=16.2 0.2x-0.4+0.5=3.7.
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(1)5x-2+1.8=3.6 5x-0.2=3.6, 5x-0.2+0.2=3.6+0.2, 5x=3.8, x=0.76; (2)7(x-1.2)=2.1 7(x-1.2)÷7=2.1÷7, x-1.2=0.3, x-1.2+1.2=0.3+1.2, x=1.5; (3)9.4x-0.4x=16.2 (9.4-0.4)x=16.2, 9x=16.2, 9x÷9=16.2÷9, x=1.8; (4)0.2x-0.4+0.5=3.7 0.2x+0.1=3.7, 0.2x+0.1-0.1=3.7-0.1, 0.2x=3.6, 0.2x÷0.2=3.6÷0.2, x=18. |
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