22,5 : ( 4,3 + 4,7 ) = 22,5 : 9 = 2,5 ( часа )
11,9 - 1 4/5 * 1 1/3 = 9,5
1) 1 4/5 * 1 1/3 = 9/5 * 4/3 = (3*4)/(5*1) = 12/5 = 2 2/5 = 2,4
2) 11,9 - 2,4 = 9,5
<span>Решите уравнения:
11х = 36- х
11x+x=36
12x=36
x=36:12
x=3
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9х + 4 = 48 - 2х
9x+2x=48-4
11x=44
x=44:11
x=4
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8 - 4х = 2х - 16
2x+4x=8+16
6x=24
x=24:6
x=4
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0.4 + 3.8 = -0.8 + 2.6
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6.8 - 1.3 х = 0.6х - 2.7
0,6x+1,3x=6,8+2,7
1,9x=9,5
x=9,5:1,9
x=5
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10у-3х-9у+7=у-4х+7=-2,2-4*0,2+7=4