0.4x-3.8=7.4 1.6×5+2x=12.6 3.2x+2.8x=4.8 【x-5]x8=5.6 13【2x+3x】=16_数学解答

0.4x-3.8=7.4 1.6×5+2x=12.6 3.2x+2.8x=4.8 【x-5]x8=5.6 13【2x+3x】=169

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解答

0.4x - 3.8 = 7.40.4x = 7.4 + 3.80.4x = 11.2x = 11.2 ÷ 0.4x = 281.6 × 5 + 2x = 12.68 + 2x = 12.62x = 12.6 - 82x = 4.6x = 4.6 ÷ 2x = 2.33.2x + 2.8x = 4.86x = 4.8x = 4.8 ÷ 6x = 0.8(x - 5) × 8 = 5.6x...