Câu hỏi của Nguyễn Thảo Hân

Question

Không quy đồng mẫu các phân số hãy thính hợp lí tổng sau :B= $\frac{5}{2.1}+\frac{4}{1.11}+\frac{3}{11.2}+\frac{1}{2.15}+\frac{13}{15.4}$HELP ME

Nguyễn Huy Tú · Accepted Answer

$\frac{1}{7}$B=$\frac{5}{2.7.1}+\frac{4}{1.7.11}+\frac{3}{11.2.7}+\frac{1}{2.7.15}+\frac{13}{15.4.7}$$\frac{1}{7}$B=$\frac{5}{2.7}+\frac{4}{7.11}+\frac{3}{11.14}+\frac{1}{14.15}+\frac{13}{15.28}$$\frac{1}{7}B=\frac{1}{2}-\frac{1}{7}+\frac{1}{7}-\frac{1}{11}+\frac{1}{11}-\frac{1}{14}+\frac{1}{14}-\frac{1}{15}+\frac{1}{15}-\frac{1}{28}$$\frac{1}{7}B=\frac{1}{2}-\frac{1}{28}$$\frac{1}{7}B=\frac{13}{28}$B=$\frac{13}{28}:\frac{1}{7}$B=$\frac{13}{4}$Câu trả lời: $\frac{1}{7}$B=$\frac{5}{2.7.1}+\frac{4}{1.7.11}+\frac{3}{11.2.7}+\frac{1}{2.7.15}+\frac{13}{15.4.7}$$\frac{1}{7}$B=$\frac{5}{2.7}+\frac{4}{7.11}+\frac{3}{11.14}+\frac{1}{14.15}+\frac{13}{15.28}$$\frac{1}{7}B=\frac{1}{2}-\frac{1}{7}+\frac{1}{7}-\frac{1}{11}+\frac{1}{11}-\frac{1}{14}+\frac{1}{14}-\frac{1}{15}+\frac{1}{15}-\frac{1}{28}$$\frac{1}{7}B=\frac{1}{2}-\frac{1}{28}$$\frac{1}{7}B=\frac{13}{28}$B=$\frac{13}{28}:\frac{1}{7}$B=$\frac{13}{4}$

nguyenzuka · Answer

1717B=52.7.1+41.7.11+311.2.7+12.7.15+1315.4.752.7.1+41.7.11+311.2.7+12.7.15+1315.4.7

1717B=52.7+47.11+311.14+114.15+1315.2852.7+47.11+311.14+114.15+1315.28

17B=12−17+17−111+111−114+114−115+115−12817B=12−17+17−111+111−114+114−115+115−128

17B=12−12817B=12−128

17B=132817B=1328

B=1328:171328:17

B=134

1717B=52.7.1+41.7.11+311.2.7+12.7.15+1315.4.752.7.1+41.7.11+311.2.7+12.7.15+1315.4.7

1717B=52.7+47.11+311.14+114.15+1315.2852.7+47.11+311.14+114.15+1315.28

17B=12−17+17−111+111−114+114−115+115−12817B=12−17+17−111+111−114+114−115+115−128

17B=12−12817B=12−128

17B=132817B=1328

B=1328:171328:17

B=134

1717B=52.7.1+41.7.11+311.2.7+12.7.15+1315.4.752.7.1+41.7.11+311.2.7+12.7.15+1315.4.7

1717B=52.7+47.11+311.14+114.15+1315.2852.7+47.11+311.14+114.15+1315.28

17B=12−17+17−111+111−114+114−115+115−12817B=12−17+17−111+111−114+114−115+115−128

17B=12−12817B=12−128

17B=132817B=1328

B=1328:171328:17

B=134

1717B=52.7.1+41.7.11+311.2.7+12.7.15+1315.4.752.7.1+41.7.11+311.2.7+12.7.15+1315.4.7

1717B=52.7+47.11+311.14+114.15+1315.2852.7+47.11+311.14+114.15+1315.28

17B=12−17+17−111+111−114+114−115+115−12817B=12−17+17−111+111−114+114−115+115−128

17B=12−12817B=12−128

17B=132817B=1328

B=1328:171328:17

B=134

1717B=52.7.1+41.7.11+311.2.7+12.7.15+1315.4.752.7.1+41.7.11+311.2.7+12.7.15+1315.4.7

1717B=52.7+47.11+311.14+114.15+1315.2852.7+47.11+311.14+114.15+1315.28

17B=12−17+17−111+111−114+114−115+115−12817B=12−17+17−111+111−114+114−115+115−128

17B=12−12817B=12−128

17B=132817B=1328

B=1328:171328:17

B=134

1717B=52.7.1+41.7.11+311.2.7+12.7.15+1315.4.752.7.1+41.7.11+311.2.7+12.7.15+1315.4.7

1717B=52.7+47.11+311.14+114.15+1315.2852.7+47.11+311.14+114.15+1315.28

17B=12−17+17−111+111−114+114−115+115−12817B=12−17+17−111+111−114+114−115+115−128

17B=12−12817B=12−128

17B=132817B=1328

B=1328:171328:17

B=134

1717B=52.7.1+41.7.11+311.2.7+12.7.15+1315.4.752.7.1+41.7.11+311.2.7+12.7.15+1315.4.7

1717B=52.7+47.11+311.14+114.15+1315.2852.7+47.11+311.14+114.15+1315.28

17B=12−17+17−111+111−114+114−115+115−12817B=12−17+17−111+111−114+114−115+115−128

17B=12−12817B=12−128

17B=132817B=1328

B=1328:171328:17

B=134

1717B=52.7.1+41.7.11+311.2.7+12.7.15+1315.4.752.7.1+41.7.11+311.2.7+12.7.15+1315.4.7

1717B=52.7+47.11+311.14+114.15+1315.2852.7+47.11+311.14+114.15+1315.28

17B=12−17+17−111+111−114+114−115+115−12817B=12−17+17−111+111−114+114−115+115−128

17B=12−12817B=12−128

17B=132817B=1328

B=1328:171328:17

B=134Câu trả lời: 1717B=52.7.1+41.7.11+311.2.7+12.7.15+1315.4.752.7.1+41.7.11+311.2.7+12.7.15+1315.4.7

1717B=52.7+47.11+311.14+114.15+1315.2852.7+47.11+311.14+114.15+1315.28

17B=12−17+17−111+111−114+114−115+115−12817B=12−17+17−111+111−114+114−115+115−128

17B=12−12817B=12−128

17B=132817B=1328

B=1328:171328:17

B=134

1717B=52.7.1+41.7.11+311.2.7+12.7.15+1315.4.752.7.1+41.7.11+311.2.7+12.7.15+1315.4.7

1717B=52.7+47.11+311.14+114.15+1315.2852.7+47.11+311.14+114.15+1315.28

17B=12−17+17−111+111−114+114−115+115−12817B=12−17+17−111+111−114+114−115+115−128

17B=12−12817B=12−128

17B=132817B=1328

B=1328:171328:17

B=134

1717B=52.7.1+41.7.11+311.2.7+12.7.15+1315.4.752.7.1+41.7.11+311.2.7+12.7.15+1315.4.7

1717B=52.7+47.11+311.14+114.15+1315.2852.7+47.11+311.14+114.15+1315.28

17B=12−17+17−111+111−114+114−115+115−12817B=12−17+17−111+111−114+114−115+115−128

17B=12−12817B=12−128

17B=132817B=1328

B=1328:171328:17

B=134

1717B=52.7.1+41.7.11+311.2.7+12.7.15+1315.4.752.7.1+41.7.11+311.2.7+12.7.15+1315.4.7

1717B=52.7+47.11+311.14+114.15+1315.2852.7+47.11+311.14+114.15+1315.28

17B=12−17+17−111+111−114+114−115+115−12817B=12−17+17−111+111−114+114−115+115−128

17B=12−12817B=12−128

17B=132817B=1328

B=1328:171328:17

B=134

1717B=52.7.1+41.7.11+311.2.7+12.7.15+1315.4.752.7.1+41.7.11+311.2.7+12.7.15+1315.4.7

1717B=52.7+47.11+311.14+114.15+1315.2852.7+47.11+311.14+114.15+1315.28

17B=12−17+17−111+111−114+114−115+115−12817B=12−17+17−111+111−114+114−115+115−128

17B=12−12817B=12−128

17B=132817B=1328

B=1328:171328:17

B=134

1717B=52.7.1+41.7.11+311.2.7+12.7.15+1315.4.752.7.1+41.7.11+311.2.7+12.7.15+1315.4.7

1717B=52.7+47.11+311.14+114.15+1315.2852.7+47.11+311.14+114.15+1315.28

17B=12−17+17−111+111−114+114−115+115−12817B=12−17+17−111+111−114+114−115+115−128

17B=12−12817B=12−128

17B=132817B=1328

B=1328:171328:17

B=134

1717B=52.7.1+41.7.11+311.2.7+12.7.15+1315.4.752.7.1+41.7.11+311.2.7+12.7.15+1315.4.7

1717B=52.7+47.11+311.14+114.15+1315.2852.7+47.11+311.14+114.15+1315.28

17B=12−17+17−111+111−114+114−115+115−12817B=12−17+17−111+111−114+114−115+115−128

17B=12−12817B=12−128

17B=132817B=1328

B=1328:171328:17

B=134

1717B=52.7.1+41.7.11+311.2.7+12.7.15+1315.4.752.7.1+41.7.11+311.2.7+12.7.15+1315.4.7

1717B=52.7+47.11+311.14+114.15+1315.2852.7+47.11+311.14+114.15+1315.28

17B=12−17+17−111+111−114+114−115+115−12817B=12−17+17−111+111−114+114−115+115−128

17B=12−12817B=12−128

17B=132817B=1328

B=1328:171328:17

B=134

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