Вычислите рациональным способом: 1) 8.3*7+4.5*7+1.7*7+5.5*7= 2)...

Question

Вычислите рациональным способом:
1) 8.3*7+4.5*7+1.7*7+5.5*7=
2) 0.85*4+0.73*5+0.15*4+0.27*5=
3) 5.25*2+6.31*3+2*0.75+3*0.69=
4) 9.75*10+0.07*100+0.25*10+0.03*100=

Answer 1

1) 8.3*7+4.5*7+1.7*7+5.5*7= 7*(8.3+4.5+1.7+5.5) = 7*(10+10) = 140
2) 0.85*4+0.73*5+0.15*4+0.27*5= 4*(0.85 + 0.15) + 5*(0.73+0.27) = 4+5 = 9
3) 5.25*2+6.31*3+2*0.75+3*0.69= 2*(5.25+0.75) + 3*(6.31+0.69) = 2*6 + 3*7 = 33
4) 9.75*10+0.07*100+0.25*10+0.03*100= 10*(9.75+0.25) + 100*(0.07+0.03) = 100 + 10 = 110

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