вычислите более рациональным способом 1 ) ( 0,9 × 5 + 5 × 0,6 ) - ( 0,7 × 2 + 3 × 0,7 )
2) (13×2,5-2,5×9)+(8×5,6-3,1×8)
3) (3,61×7+7×1,3)-(2,26×4+3×2,26)
2) (13×2,5-2,5×9)+(8×5,6-3,1×8)
3) (3,61×7+7×1,3)-(2,26×4+3×2,26)
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Answers & Comments
2) ............=2,5(13-9)+8(5,6-3,1)=2,5*4+8*2,5=2,5(4+8)=2,5*12=30
3) ............=7(3,61+1,3) - 2,26(4+3)=7*4,91 - 2,26*7=7(4,91-2,26)=7*2,65=18,55
Verified answer
1) 5(0,9+0,6)-0,7(2+3) =5*1,5-0,7*5=5(1,5-0,7)=42) 2,5(13-9)+8(5,6-3,1)=2,5*4+2,5*8=2,5*(4+8)=2,5*12=30
3) 7(3,61+1,3)-2,26(4+3)=7*4.91-7*2,26=7(4,91-2,26)=7*2,65=18,55