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)2a×14×(−5)−30a×(−56)=−122)5×(−75b)−2b×(−3)×125=−23)0.5b×1.3×(−11a)−33a×6.5b=104)3.1×(−6.6)×(−4ab)−88ab×9.3=−10
\begin{lgathered}1)(4a - 7a) \div 0.6 = - 3a \div 0.6 = - 5a \\ a = 8 = > - 5 \times 8 = - 40 \\ a = - 2 = > - 5 \times ( - 2) = 10 \\ 2)(9.3b - 1.5b) \div ( - 6) = 7.8b \div ( - 6) = - 1.3b \\ b = 4 = > - 1.3 \times 4 = - 5.2 \\ b = - 5 = > - 1.3 \times ( - 5) = 7.5 \\ 3)(2.1c - 6c) \div ( - 1.3) = - 3.9c \div ( - 1.3) = 3c \\ c = \frac{1}{3} = > 3 \times \frac{1}{3} = 1 \\ c = 0.5 = > 3 \times 0.5 = 1. \\ 4)(6.7d - 9.5d) \div ( - 7) = - 2.8d \div ( - 7) = 0.4d \\ d = 2.5 = > 0.4 \times 2.5 = 1 \\ d = - 6 = > 0.4 \times ( - 6) = - 2.4\end{lgathered}1)(4a−7a)÷0.6=−3a÷0.6=−5aa=8=>−5×8=−40a=−2=>−5×(−2)=102)(9.3b−1.5b)÷(−6)=7.8b÷(−6)=−1.3bb=4=>−1.3×4=−5.2b=−5=>−1.3×(−5)=7.53)(2.1c−6c)÷(−1.3)=−3.9c÷(−1.3)=3cc=31=>3×31=1c=0.5=>3×0.5=1.4)(6.7d−9.5d)÷(−7)=−2.8d÷(−7)=0.4dd=2.5=>0.4×2.5=1d=−6=>0.4×(−6)=−2.4

Flower1777_zn (312 баллов) 28 Май, 18

annaglukhikh07_zn · Answer 1 · 2018-05-28T00:55:30+0000

$1) \frac{ - 30a \times ( - 56)}{2a \times 14 \times ( - 5)} = - 12 \\ 2) \frac{ - 2b \times ( - 3) \times 125}{5 \times ( - 75b)} = - 2 \\ 3) \frac{ - 33a \times 6.5b}{0.5b \times 1.3 \times ( - 11a)} = 10 \\ 4) \frac{ - 88ab \times 9.3}{3.1 \times ( - 6.6) \times ( - 4ab)} = - 10$

- 5 \times 8 = - 40 \\ a = - 2 = > - 5 \times ( - 2) = 10 \\ 2)(9.3b - 1.5b) \div ( - 6) = 7.8b \div ( - 6) = - 1.3b \\ b = 4 = > - 1.3 \times 4 = - 5.2 \\ b = - 5 = > - 1.3 \times ( - 5) = 7.5 \\ 3)(2.1c - 6c) \div ( - 1.3) = - 3.9c \div ( - 1.3) = 3c \\ c = \frac{1}{3} = > 3 \times \frac{1}{3} = 1 \\ c = 0.5 = > 3 \times 0.5 = 1. \\ 4)(6.7d - 9.5d) \div ( - 7) = - 2.8d \div ( - 7) = 0.4d \\ d = 2.5 = > 0.4 \times 2.5 = 1 \\ d = - 6 = > 0.4 \times ( - 6) = - 2.4" alt="1)(4a - 7a) \div 0.6 = - 3a \div 0.6 = - 5a \\ a = 8 = > - 5 \times 8 = - 40 \\ a = - 2 = > - 5 \times ( - 2) = 10 \\ 2)(9.3b - 1.5b) \div ( - 6) = 7.8b \div ( - 6) = - 1.3b \\ b = 4 = > - 1.3 \times 4 = - 5.2 \\ b = - 5 = > - 1.3 \times ( - 5) = 7.5 \\ 3)(2.1c - 6c) \div ( - 1.3) = - 3.9c \div ( - 1.3) = 3c \\ c = \frac{1}{3} = > 3 \times \frac{1}{3} = 1 \\ c = 0.5 = > 3 \times 0.5 = 1. \\ 4)(6.7d - 9.5d) \div ( - 7) = - 2.8d \div ( - 7) = 0.4d \\ d = 2.5 = > 0.4 \times 2.5 = 1 \\ d = - 6 = > 0.4 \times ( - 6) = - 2.4" align="absmiddle" class="latex-formula">