Вопрос школьника по предмету Математика
1)Решите удобным способом
A)11/13×(-3/7+13/22)+3/13×(11/7-13/3)11=
B)-0.5×2 1/2×(-2)×(-7/15)=
C)-25×1.34×(-4)×(-1)=
Ответ учителя по предмету Математика
a)1/13*25/14-1/13*58/7=25/182-58/91=25-116/182=-91/182=-1/2 или -0,5
B)-0.5*2*0.5*(-2)*(-7/15)=-1*7/15=-7/15
C)-(25*1.32*4*1)=-(33*4*1)=-(132*1)=-132
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или Past Perfect.
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the students already (to open) their books.
2 My friend (to show) me a mobile phone
which he (to buy) the day before.
3 The teacher (to understand) that John (not to prepare)
for the exam well enough.
4 We (to return) from the cinema by nine o’clock.
5 I (to do) all my work at six o’clock.
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7 Then he (to come) to the shelf, (to take) one book and (to begin) to read it.
8 I just (to find) the money I was looking for.
9 When your friend (to return) from the South? – He (to return) yesterday.
10 They (to leave) England when he (to be) a child.
11.You (to see) Peter? – I (not to see) him since last month